Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4a1a757074d70f3…

MALICIOUS

PDF

90.1 KB Created: 2021-08-12 01:41:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a29168d05f6cf2047e16150a7598f79b SHA-1: d0d4f6493b247bb897ee5ddee4c466f584f18971 SHA-256: b4a1a757074d70f3c0762ed0a55f338b931f13584a47097c6c9c4cf33f98ee71
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm or phishing lure. The document body is unreadable, but the heuristics and URLs strongly indicate a pattern of directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/531a88ac3a5f9672082075e87aabd544/73503314549.pdf In PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/5317e8cb53bd09130d0a5ddf85b95a24/97810438510.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/66029085286.pdfIn PDF document text
    • https://webmenuplus.com/images/file/nepotiweputili.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/gatadasod.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160e13d6c36e7c---zadimokidibotijezow.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/b3faa482cd0b3f5dbbc8002cf6651fd6/67401683228.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/4e70a3cfbd3790b92fae176329065bf1/gemopofizazaluwatep.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1c47cc463c3311822ff7dc77a35fed0b/dinovisatifitujibikudok.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16090a8e966ef4---56177714747.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100a67e99a71---8927603813.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210812_B42B51039F597729.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/58696933949.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/rifer.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/88998006308.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/n1vih59mr4ask9f0nn6j057105/wogubujupipo.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/62b182a350531743fc67d078bec8767b/10561008527.pdfIn PDF document text
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/gobipalumerug.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/29040b21207d45d2e4e94b5985366999/rajopapejidefalefi.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b4bc9019d63---jepumelak.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/4452317e6895c289f14d6c2b7dd5dd30/kefulomifivoxajos.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/xudewulevovavugagulus.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/99735719240.pdfIn PDF document text
    • http://designgaleria.hu/userfiles/file/vosub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=kenmore+coldspot+106+parts+listPDF 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_off0000fa4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4E 11008 bytes
SHA-256: c85668fc6ea561cb6efe46c1fdc0a82cf907fd514f77ac22289557b983d4eb5b
font_01_sfnt_off000113e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF3 18032 bytes
SHA-256: e8ed9709979fb27c84c58f352d9b4b5462020cd203798e3eaa0a78def4725c86

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