Malicious PDF — malware analysis report

Static analysis result for SHA-256 e89756be8b0492e5…

MALICIOUS

PDF

83.3 KB Created: 2021-09-08 20:37:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a58d429f2648b7431a9d4325ebdd9f7b SHA-1: e159ada5480cbeea2c5042c577d60ff54f004ffb SHA-256: e89756be8b0492e5af5d3dc3ebc5121dc045d09f8cc343fd6cb88bebc6c867ad
176 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a callback phishing or tech-support scam. It contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting an attempt to distribute malicious content or redirect users. The heuristic 'SE_CALLBACK_LURE' strongly indicates the document's intent to trick users into calling a fraudulent number.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://irlanc.ru/uplcv?utm_term=basic+english+topics+pdf PDF link annotation
    • http://faurerom.com/userfiles/file/dakapatazeginuti.pdfIn PDF document text
    • http://tarnava.eu/user_images/file/wusajofozinasegemew.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/p1inn5vagdsrkfjgbauq82hdqu/70067726620.pdfIn PDF document text
    • https://www.tratedu.net/ssss2018/assets/143ad273/ckfinder/core/connector/php/upload/userfiles/files/57e01be5a6979bc685d1abaf9b53db44.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/1a8ecdec72f006f36d5eb228f094604e/redotaxawefumog.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/82253811345.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/33070406379.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/82937536049.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/vusifajesife.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/detitupatarolipe.pdfIn PDF document text
    • http://mamitobe.ru/files/file/jatowerusela.pdfIn PDF document text
    • http://traiteurluc.com/userfiles/file/90744214719.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/lapupig.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/jozopakitebuwosubogoz.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/surafezob.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/cd53c77658393d579cbbf9f25a2cb3b9/zomuboferaxopat.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/76987420709.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16134f6cfbe3be---nezalit.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/49688382236.pdfIn PDF document text
    • http://praguetransfer.com/files/file/64160752091.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1630495250.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/65715333161.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/75287817261.pdfIn PDF document text
    • 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_off0000e14b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f95d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95D 17300 bytes
SHA-256: d1df441e989ff91a5227b55bc2016a6d8a75441f9dfff7fe821e08e7cc60a7cb
font_02_sfnt_off000126b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B6 10852 bytes
SHA-256: a2a76040adaea9983bc73b44ce6bf1f0258b719176137380be96e8e64a07d226

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