Malicious PDF — malware analysis report

Static analysis result for SHA-256 df64f7b909d93902…

MALICIOUS

PDF

113.8 KB Created: 2021-08-16 18:23:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 38e65fcef52415e85bc2fcffcf085f17 SHA-1: d3f0c7568a2117fff06fa62386b4e7d08e92052c SHA-256: df64f7b909d939028c4bc3ee39327fc81cc383c100b7a05d170bc3a0e9a173c1
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs pointing to potentially compromised WordPress sites, suggesting it functions as a link farm to distribute further malware or phishing content. The presence of a 'download button' lure and the general structure of a link farm strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://medvor.ru/uplcv?utm_term=gta+5+ship+cheat+pc PDF link annotation
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b538e3578---92597997232.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/da361555bd04a06b8176e80130b11778/tevage.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/gubisederozu.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/e094c3c6dfddf2da0c70abbd449834a1/63970920838.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/52554771504.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a53b873a3---nejineluwub.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a07073352c---15288147980.pdfIn PDF document text
    • http://jn-zhsc.com/upload/zadifelizoxuvolodaluzid.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/4e58ba53cc9c257715365d5fd6242566/xudedavetodovajirora.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/f47ba3b8ae5b90e1a93bb340b57464a9/galibofafesiw.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///jufutajufisekufavexategu.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160813e7de07a8---19162247020.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/95170348360.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087cb2c96215---26645604417.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3a6380fe1---39931480197.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/c3a3cd854e0394398ea6e4c1f2f6b891/deginodotifibim.pdfIn PDF document text
    • https://ckmandarin.com/uploads/48994493473.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/30tujel3ij2381d6996j6n0o3b/64804080668.pdfIn PDF document text
    • http://deepakbatteries.com/uploads/file/78903326350.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/ffkb02vd0hvgdhmgo01qtteiq7/82571649244.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/xamezunowiwidovuf.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/07af28ae9b2d4a44c4bdf2d7879dad98/47367017118.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/ro654i2tqp3em9udejkkjng99a/69197707821.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/62121626998.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/ahgksbgaqvaja08ovsatv3r8g0/68782274472.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/tu8kmk9n3rafetci4k01nva455/42828634754.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_off00015bf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17408 10276 bytes
SHA-256: 4d7a7f7af9121ea2e5e44a0aab5169a578de7d082e19615cc12623f2643d67d1
font_02_sfnt_off00018b6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B6B 17628 bytes
SHA-256: 27c4b9f029bed0237206e0f999d21d66d02a217b70f972474ef240aa385867d9

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