Malicious PDF — malware analysis report

Static analysis result for SHA-256 a737bd03e0b3a92a…

MALICIOUS

PDF

87.8 KB Created: 2021-09-06 11:06:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1175510b5dee95ed2ce6c544a1e5372e SHA-1: a50eac05d2b30e101641079ff755239951437b48 SHA-256: a737bd03e0b3a92a776e7e915474077a8ad031cb2a5c02070aa7a8461a62f772
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to domains that are either disposable or associated with compromised WordPress installations, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of 'utm_term' parameters in some URLs suggests an attempt to track user engagement with the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://laborke.ru/uplcv?utm_term=katowice+climate+package+pdf PDF link annotation
    • http://spamsmsgiare.com/media/ftp/file/85438773015.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/18259165350.pdfIn PDF document text
    • http://idcla.net/upload/files/goxexijemipika.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf845c7f071---xotomevasisani.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d915bc748---kujeropagukeb.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/04e23e0c19d20a81b79909ee376e19bd/gafavimevi.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/odgbak6s26sgqoelqpmatfvj43/wejoxeduvunonekibefano.pdfIn PDF document text
    • http://budka39.ru/files/64559138355.pdfIn PDF document text
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/xutopose.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/bde23fb01dfb34ec373f7c8439bf6f8a/41293992390.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/591ce95978191e1464fb965254a3fd40/43818651505.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/a361f5a9db35d2b4f731085a90fb4607/lodavuworigutedawiguxeto.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbce8613624---66761152780.pdfIn PDF document text
    • http://com123.vn/uploads/file/72785343786.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/jovesafikopawatunu.pdfIn PDF document text
    • http://mmdplus.com/userfiles/files/20210615_090847.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/781899d429519b9f2b7c6238567db812/tezekezexedifezu.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/e2adbdd27e8664a7671bd91de84e8f9d/wowamasukiwududimomegi.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/sorewurorotumukoxa.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607539d0c4046---82527922168.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/2be1d23196dd06ef32866f1713108c99/99562441228.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a2bd9dd84---lugopomuvutulaxogame.pdfIn PDF document text
    • http://cokhihoaiduc.com/uploads/files/fadogaxajef.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_off0000f108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF108 18608 bytes
SHA-256: b0b86ad2b71a51dd2c5e4fec7f38410cb206ee17a3b3f0b8c6ee51a5349c31b7
font_01_sfnt_off00012146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12146 10760 bytes
SHA-256: 19fb5b5cb47370ac1a59462ab3f96b8a7ae756d76afb148e993bf8a14ca67a56
font_02_sfnt_off000139ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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