Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5df9d0e988f77c9…

MALICIOUS

PDF

86.7 KB Created: 2021-09-15 20:26:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0ffca49728d422034d5d0a03c51e748f SHA-1: 764d6e88d41776fd815f15ba2d18fc8118c08fa4 SHA-256: f5df9d0e988f77c92f68f19523a44b90841f9040607832dc95cd6430cd123ed7
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to other PDF files hosted on various domains, some of which appear to be compromised CMS upload locations. The document body is heavily obfuscated and contains no readable text, suggesting its primary purpose is to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://izr.fr/files/50911488906.pdf In PDF document text
    • http://yuha.be/_files/file/gujifamamanurokigorajenu.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/94202640344.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/sadezixefuxenogavakofej.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/wozore.pdfIn PDF document text
    • https://topconta.ro/userfiles/file/80467136020.pdfIn PDF document text
    • http://mosjob.ru/images/file/12109383599.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/74005700092.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/73315841878.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/97884687664.pdfIn PDF document text
    • https://nada70.org/userfiles/file/vabegojinanovozugaregi.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/51907088382.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ccae882dc0---26137987233.pdfIn PDF document text
    • http://hzqzg.com/d/files/2752650427.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/26800833925.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138e32c5f090---xunepiwimegonojilusej.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161351e1bc05ea---nulale.pdfIn PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/27914529480.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3e8211958---39565470780.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/20074493427.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/befelinerixijob.pdfIn PDF document text
    • http://hzxgdz.com/images/upload/File/lelijarojofa.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139bc8528172---29018934111.pdfIn PDF document text
    • http://panova-art.com/files/file/bulakalej.pdfIn PDF document text
    • http://jsqnchem.com/upload/files/27102326731.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/fabiguwusedagumijux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=old+malayalam+christian+devotional+songs+mp3+free+download+by+kesterPDF 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_off0000df45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF45 22268 bytes
SHA-256: 1b79bd5e98ad5848b79bd8eb472301636a7d04bc0b84b32d3a52a9b340a46e2e
font_01_sfnt_off000118b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B2 11760 bytes
SHA-256: 4b05adcdcfbac90e48079bed4edcf540d181f4106fdc1542b85e05b949189dbb
font_02_sfnt_off0001344c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1344C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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