Malicious PDF — malware analysis report

Static analysis result for SHA-256 96c93e523e9dd341…

MALICIOUS

PDF

106.3 KB Created: 2021-06-27 22:06:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 4ecebe3beaa70c8726011c2c66b68833 SHA-1: 39492109121245216cc27b8b479c109c9cdbfce6 SHA-256: 96c93e523e9dd341797cfc1e56bcf8fa59436094cd904ad2a4f035770216f889
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a callback phishing lure. It contains numerous links to compromised WordPress sites, suggesting it's part of a larger campaign to host malicious content. Although no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to deceive users into contacting attackers via phone.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16081cdf784f27---53019240395.pdf In PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/c2c9a7d5ee196322ee095f001226addc/nulurokotesoxi.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/57166f4216c40fd9faaffd011742457a/kodeko.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16093b55b28890---26530965032.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc8ed39ac9---mojumevaduxupezizajesexa.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/hvm4o92pj7rt2ancaics2i1dc2/75200105738.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/f41ru4h412j6d80c6dscd1ebvd/kazabad.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/db76083b2775f6819aa931262aff0da2/xurapomum.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b73b1f183b8---lozagozina.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/fab109943e48bcf7ef3f27d7a16a3711/75161619651.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5030251af---wofotedoxiwawarojini.pdfIn PDF document text
    • https://adikkeempat.com/contents//files/4705994427.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/d28d48dd3ae0c5b288bf5424c311a6c7/28295094175.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/tulewotuf.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/19441028769.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/53a0842db61eebbd00465fab18500dcf/zapizizefakufadifewonaza.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a81994c5cf7---fugepuxajupulatawine.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/21232523398.pdfIn PDF document text
    • https://mimpishio2.net/contents//files/15630398283.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/8d1848d717fff3564288ef1b6abb8331/mopuxemutimesimewiwodig.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077cc6bbe1cf---nagefidefirujamanetalamix.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1c12a07c8---42306564533.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/ec9ec4095e19e092762a16e9d62533fe/bevonulepi.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/8fckg4bnt0n98o6hbhfebq4pc2/84616397791.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d7955bf238f---zaxomurimuvo.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c99a8a41a43---28334035153.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=greeley+co+arrest+recordsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013cae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CAE 10320 bytes
SHA-256: d9ffa14be40fbed6603a1d9f37c3bd89f6528e9d71c1d061a418de0b9c627d24
font_01_sfnt_off0001542c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1542C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016c3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C3E 18080 bytes
SHA-256: b593d9f26532449f54180c9d5db29f632decd2f96609f47fe170158046c5d390