Malicious PDF — malware analysis report

Static analysis result for SHA-256 e26939cc55493c2c…

MALICIOUS

PDF

82.5 KB Created: 2021-09-02 06:09:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 96a2598b115ae1a8d76cb813acc9f4e9 SHA-1: 45085e15e1937e5893f48d61fadc858b6e17c376 SHA-256: e26939cc55493c2c81d1079ef3b87d2200db229fbad03fd0447862f71045ea97
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's likely a phishing or malware distribution lure. It functions as a link farm, with numerous embedded URLs pointing to external sites, some of which are hosted on compromised CMS platforms. The primary purpose appears to be directing users to potentially malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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://clifestyle.net/uploades/userfiles/file/26506953979.pdf In PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/34bfec97af9a12adbcf263f33fb46c2c/loliroxokomoxep.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/cfe9866f5c45e25e345172543fa3207b/80745494376.pdfIn PDF document text
    • https://www.cascatai.com.br/ckfinder/userfiles/files/nepuvuzidejemenosinesu.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/67743640007.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/gekunokedi.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/75834314205.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b4cb83dac45---70333236383.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/zuxilolozu.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/xetemakafexelirorilob.pdfIn PDF document text
    • https://signika.pl/Upload/file/fowig.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/jafuvesajibomo.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/06b127ac1bdcc1a86b148621a3c7fbd0/64350319470.pdfIn PDF document text
    • http://greenbiotech.vn/uploads/userfiles/file/rigadazozevem.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/85541732111.pdfIn PDF document text
    • http://dominopark.pl/public/upload/ckfinder//userfiles/files/69134160291.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/16099020b490cb---mimumone.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16129f1e6b4d98---89667440301.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/8rvkjt3f038suifdd9t4v50cr8/81658952206.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/netide.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/vimasiwodorosaxamoxafibu.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/11814514836.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160d0a985d661e---dokivive.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16117e940d42db---niduxulesikosotofeju.pdfIn PDF document text
    • https://jagamimpi.org/contents//files/38387757754.pdfIn PDF document text
    • https://le27.fr/docs/file/mizigole.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=easter+2005+datePDF 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_off0000dccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCC 18212 bytes
SHA-256: cd137795fbfb8eea8547ac6fa8a1f7e5cfe34b933e43a27ed68d4e8756865ab3
font_01_sfnt_off00010ae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122FF 10240 bytes
SHA-256: c80e5d67a98a655f511ebbd079a3df3f8c6cdd487e986735212ddce9e379b7d2

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