Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c9d17f1ecd8e4de…

MALICIOUS

PDF

85.9 KB Created: 2021-07-20 11:31:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cb11fbde3b663b85f808cb768dbf6c35 SHA-1: 99c022a1e5783f14ddc801f277e3a0997a64e75f SHA-256: 0c9d17f1ecd8e4def632ec7f0a45c0b945ab4225af77bb6c20549839d0eff63c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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 http://brianhaymore.com/images/e/file/81622538132.pdf In PDF document text
    • http://goldenpoolandsauna.com/user_img/files/mowev.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/21314975455.pdfIn PDF document text
    • http://doyen.cc/images/upload/File/59768568701.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/3d8be5a0b6ccda68952a5b0fd5ecedc2/26842104731.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/43084541626.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0dbb03f29---rorimukurukiwuzedo.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/wixeju.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/xakikitizupetowerezujidi.pdfIn PDF document text
    • https://hsse.cl/files/popirawugelitof.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a636a723aa3---vitulipufido.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/63510430075.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/44881142210.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/5dc979dd1e2ab475d6d58a97e2f5e5c5/18294099886.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/5i34c3k02sm1hjo06juibojjtk/xelekifejeruxaj.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/94996e89e16a83ba10d756e8e5b43a13/53339132051.pdfIn PDF document text
    • https://amblamy.ee/upload/file/48281534619.pdfIn PDF document text
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/34596511117.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/5gagbumbgchb7nov11g123k2jl/mavaxogovojimaka.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/070c6515b73f81423f87301d596f4381/96125698603.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/dodedutisoguxulevelav.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/sakiguginisifujo.pdfIn PDF document text
    • https://monyetjoget.com/contents//files/jojumow.pdfIn PDF document text
    • https://energooptima.hu/upload/File/79801792946.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160f3bf2044101---lokaporo.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a918fdd799c---60309123573.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=imo+for+pc+2020PDF 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_off0000eeb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CA 10032 bytes
SHA-256: 4de64a9bf88dc7ca2a1f68a963e9d6caddd50990215405fe6eddcfb552fd31f8
font_02_sfnt_off00011d09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D09 17436 bytes
SHA-256: 9b00e40de587e4819b649bc548552c987f3d023b5d774ef71959ea002aa87b50

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