Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c749fb055f781e4…

MALICIOUS

PDF

79.8 KB Created: 2021-10-18 03:08:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 1159272cbb2d46955bb45bc7f77dd857 SHA-1: 4bad624c78ba4302b3a7aa6760f5170b99da037c SHA-256: 8c749fb055f781e46a9ff5a6b0e78af04c1d9447171b7370525f4f01e8db2c75
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a callback phishing or tech-support scam, as indicated by the 'SE_CALLBACK_LURE' heuristic. It contains embedded JavaScript, suggesting an attempt to execute malicious code or redirect the user. The presence of numerous links pointing to disposable hosting and compromised CMS upload storage further supports a malicious intent, likely to host malicious content or facilitate further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • 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) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 https://cincia.ro/ckfinder/userfiles/files/86586780742.pdf In PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/41169296436.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/80521900289.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16160f67d3c6fd---pinoto.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/51446629869.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/42060878901.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1616bb4397c775---6917411590.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/dd1e14b6b9c62ab0d159c49874453516/73506727632.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/xifexuwojowibefubesores.pdfIn PDF document text
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/18492314419.pdfIn PDF document text
    • http://www.rannatennis.ee/data/upfiles/files/vukajawiw.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/95584087470.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/wisorifufoduz.pdfIn PDF document text
    • https://havilahbuilders.com/userfiles/file/jupelexefazinosiru.pdfIn PDF document text
    • https://coombs.gocascadia.com/images/cms/file/medusipotijo.pdfIn PDF document text
    • https://nusamulticentralestari.com/Uploads/userfiles/files/42931512351.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/tg17i03jc03fippnf7phd8379k/gaxovuvak.pdfIn PDF document text
    • http://ketex.com/trcgp/ckfinder/userfiles/files/83379757492.pdfIn PDF document text
    • https://www.tristar-technology.com/ckfinder/userfiles/files/jurumolubisidasugeke.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/82553196973.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/davoxasunoxetafolefoto.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/57066738382.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/BGAemAmcdTc/uplcv?utm_term=how+do+you+unblock+a+phone+number+on+this+phonePDF 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_off0000d128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD128 11304 bytes
SHA-256: 9026e029ed787af27cf7e63400e7a7a7afbb7bb70942901ad6abcf62cfcba738
font_01_sfnt_off0000eb51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10363 17540 bytes
SHA-256: a6eccdf4d43d7d1bacb704c1870642557dfafbe2360174288f81d6e447c4b56a

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