Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fb02f812144de8b…

MALICIOUS

PDF

91.7 KB Created: 2021-08-17 08:45:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 2cd558e95bb834a84782f31a266c3ddc SHA-1: 7266f44308b52a37ff5c391e91a6a0c9c1ca39a4 SHA-256: 4fb02f812144de8bc8d5ecb877712a7d4b939eed88162abf1f758dc5c75f156d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a phishing lure. The heuristic 'SE_CALLBACK_LURE' indicates the document likely prompts the user to call a phone number for fraudulent purposes. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it may host or link to malicious content, potentially leveraging JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160f251d441edf---48402118038.pdf In PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/falunurotizuwojufomedo.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c54c973e88---35225811307.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210513005403143191371.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608977b5ba7a9---79700165307.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/15509873241.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608485e96ea6b---bifizi.pdfIn PDF document text
    • https://ecole-anglais.com/upload/files/92477134891.pdfIn PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/mijinon.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/37512249103.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160d6d57b1ece4---96084330637.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/21522588313.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b7161aabcc627ce62ea782d7279c1ddc/67215621885.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbe8285d99---pilofewixaxejunaxubumabo.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/zuwofanowogujuletuma.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/28fc4f42fb46e52414ab93a67deb1df7/23068218951.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160be5943e32bd---kutibasisiwuxidoj.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/rirokitokoto.pdfIn PDF document text
    • https://qqhanoman.com/contents//files/24582155699.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3294d6d730---79817824011.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d3ae5be043e---18270877712.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/c2f75ca1095010e37eb666c684dd329b/95435934219.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa9f07a950---pajizuzijizikugarerusugur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=vector+mechanics+for+engineers+statics+and+dynamics+answersPDF 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_off00010033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10033 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11845 17608 bytes
SHA-256: 2b6b2ad3c5f7c97fd177040e3cddb02303253753d1ab41316d11a786236d2606
font_02_sfnt_off0001462d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1462D 11044 bytes
SHA-256: b0baf2787ee402c9ca9133523bf494500af8ea5ee0a9fcf8c5349864a5f5da0e

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