Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bba4df38c57b273…

MALICIOUS

PDF

81.2 KB Created: 2021-06-14 08:09:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 541cf262a12bcf15981ab3a43d2a625d SHA-1: 461cb1cd5bfb59c75f5cdb01e03d611619934063 SHA-256: 8bba4df38c57b273ab2b460af5a7301d39a8252297f66e11116053ea5e3db721
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links to compromised WordPress sites, suggesting it's part of a link farm designed to distribute malware. The document body, though heavily obfuscated, contains references to downloading music, which is likely a lure to disguise the malicious intent of directing users to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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://inwebjor.ru/uplcv?utm_term=celine+dion+im+your+lady+mp3+download PDF link annotation
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/47dflnvjtlso842bgu58fvjpr2/80392100324.pdfIn PDF document text
    • https://maturana.cl/upload/file/wugifefunusepaz.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/2b63c347ae5beaa85e1dd7f9df1bef61/sixesetelutu.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/1598945be617828b5cba09248108b91e/kulesabebiripu.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/24c8e3c0121b32c2648e2330fe4c5df0/vafatolepimodezarogamofe.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/97006183362.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/wesajuxulavazixizumex.pdfIn PDF document text
    • http://temple.mo/userfiles/file/livowiju.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/9e82f838439418cf8986e21555959239/93924588737.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/9eac54fd352a47fc3bc77fbed3804dc2/71030012365.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/miwefarixafodosuwopuw.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/0bff69b0b77768ec7035b9946a5d4265/makizutulef.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076f6ed80d45---vevurexemexawewigiva.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/e467ea3d78bf7f1230215a737b1f91c0/gidox.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160bfbe5077fb4---zaboninelapisu.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/dajufimadatekafotew.pdfIn PDF document text
    • http://screen.by/images/file/57835331803.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED17 5108 bytes
SHA-256: 124f8ccdb09ee8cda5a1a627029ed136c1c1853c69f5b49e767ae25a2592a4a7
font_01_sfnt_off0000fe69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE69 13228 bytes
SHA-256: 107381f6c42b115f6d1f4e33df140d521bb7b3ae6d4888b01a06db5ce904e037
font_02_sfnt_off00012949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12949 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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