Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2c71abf963d7391…

MALICIOUS

PDF

95.9 KB Created: 2021-07-03 22:09:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2574d8018473b5d476c4d301cfdb54a1 SHA-1: 102dd1667312d78e320c4bc7baca2aa449d5e548 SHA-256: d2c71abf963d73917fd5980555ec4b7cc4dd77653ccd7df6a67507e0e1b28939
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external PDF files, many hosted on compromised CMS upload directories, indicating a link farm designed to distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple external links points towards an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://gilbertems.com/videos/file/bidixepu.pdf In PDF document text
    • https://maintogelonline.info/contents//files/guxiduvedusab.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/33195831456.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/82100407724.pdfIn PDF document text
    • https://narimasu-chintai.net/jcfiles/file/kafixijobivab.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/tewawixed.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a6b06b143---lejefawimereliji.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a12c94ae12b---22674809872.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/91fb1a40884a6f41a7b98f78f81f9786/vefelamimazebo.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/1s5m7m1j3m8temo1r48servhjv/vewujekabodef.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/3cvusr4peut8q3lh9vdtgnkv09/59067000921.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/mokomuwesoguderamadozeno.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/e474f5a12a38b92eeaa0806dbf24ddf5/14671411930.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/5706537209.pdfIn PDF document text
    • http://ypperfect.com/ckfinder/userfiles/files/70959296507.pdfIn PDF document text
    • http://slsnn.ru/content/file/94364323417.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/tefimamobutoneginolonaba.pdfIn PDF document text
    • http://southwest66reunion.com/clients/f/f6/f6f8b7bd17d60304c359e527a2c43449/File/63657359470.pdfIn PDF document text
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/majs7uk6da625fgrf5cu2hr8o4/94268978912.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/96298665992.pdfIn PDF document text
    • http://weddingceremoniesbybev.com/clients/72651/File/6223247014.pdfIn PDF document text
    • https://master-service.ro/images/file/tenozufowagujubasiri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=another+word+for+probabilityPDF 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_off000112fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012b0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B0D 17304 bytes
SHA-256: 38414d6413725fd64334afdcaba03b8396dccef4e7a75c99e0638fd282a221ec
font_02_sfnt_off00015850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15850 10748 bytes
SHA-256: b85debbe565f3601009c3dacfd754c24f71f54b66ae3e8f5d608d2301c0b31dc

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