Malicious PDF — malware analysis report

Static analysis result for SHA-256 a90b320e7a5fb9c2…

MALICIOUS

PDF

81.6 KB Created: 2021-06-28 09:38:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2bf6d0e8ced01332f0ba45c6c9bee107 SHA-1: 9f825e076503bfec03556192d3bf9416f8daaf44 SHA-256: a90b320e7a5fb9c27f2d11b41f831d16aa2fcf3ab277397eb3b75bff0260fb8c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan delivery mechanism. The 'SE_CALLBACK_LURE' heuristic indicates the document likely attempts to trick the user into calling a fraudulent number, consistent with tech-support scams or callback phishing. While no scripts were explicitly extracted, the presence of numerous links to potentially compromised WordPress upload directories suggests a pattern of hosting malicious content or redirecting users to further stages of an attack. The file's structure and the nature of the URLs point towards a phishing campaign designed to exploit user trust.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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) 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://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85e61ee21a---kesenolonixajikerusun.pdf In PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5d1752ca2---55267879404.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/55fe5c06f2fa53d4808f8f2be461cfd6/80397905934.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/10742179847.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160851a360c27a---43185985671.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/8779750612.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607441ee59750---savagabakasajokamu.pdfIn PDF document text
    • http://ecandrychow.pl/Image/files/49313225900.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f2b3d42ed---94712204885.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/zuxumuded.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/b5dc2e2956650c3553eabc24c637222e/wofabewagezijubakod.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/judagikuganerenuk.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099ba02dcba4---zivax.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/50238228902.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d20d9163ab---65585263858.pdfIn PDF document text
    • http://argyler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072981277203---33106321815.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/dedukevoni.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/11698378805a7b46eadb4be993eef400/nipokubobukog.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/tn8ffdpn4psn2leh8ngj3pj9t3/kizurovemobab.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/b188bf966b8d6691b68aef48c05efad8/muduromakadavipukuze.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b371f360718---gukutibakabarul.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/d586029752ef10a1be44d498b565af3b/12016901393.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/c10dca06b1e3cd70cf0d5cf4c463217f/5867929901.pdfIn PDF document text
    • https://tusenfotingen.nu/anvandarbilder/108/files/vakip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=tag+office+fayetteville+ncPDF 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_off0000db8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8E 17312 bytes
SHA-256: 7fe607e9ac1867fe1dff2cdf2d7bfad9513e6194f8f3ff9e43c27f63104b3574
font_01_sfnt_off00010923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10923 10384 bytes
SHA-256: 67b25bcd00008b30d8eca3d33e786f1c14d5ab3aa020b39fa18e88b3fc7f2fee
font_02_sfnt_off000120d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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