Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d2c85313c353eab…

MALICIOUS

PDF

77.9 KB Created: 2021-09-12 19:27:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 6dcf51954c5a83fa4b3fbb02a7989548 SHA-1: 34bb29609b3bea4adb9957cad4c9ce55edc4ba06 SHA-256: 4d2c85313c353eabdbfd6323681495509273be770c0359a47360040338be8032
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to various domains, several of which are identified as potentially compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the structure and URL patterns suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://papinchess.ru/userfiles/file/63595435803.pdf In PDF document text
    • http://pegastelco.com/pictures/files/60699834754.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__613E09518F438.pdfIn PDF document text
    • https://nieruchomoscikomercyjne.co/files/file/667311895.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/xomatewofawatog.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/rulusazipavi.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/80861636810.pdfIn PDF document text
    • http://orthopediedelft.eu/files/99532295325.pdfIn PDF document text
    • http://festacreativita.org/userfiles/file/27350204835.pdfIn PDF document text
    • https://music-group-store.com/upload/files/27272461165.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/fobevukaw.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613df28d3d464---mezariparujafosizipowaz.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/tebajena.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/75732350694.pdfIn PDF document text
    • http://sukhonthip.com/file_media/file_image/file/lozekawunurugizonug.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/t4ph3a3fi3asnksce7rsrkj46e/zanogubiwevibosaz.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/d092479aeb89b6dcc028cf4cfb5075e9/xagowegurazesagubuzufeji.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/93568085428.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/82557884403.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/boveropawe.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/31518900070.pdfIn PDF document text
    • http://blbr365.com/userfiles/file/1630799564.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud/files/6541296992.pdfIn PDF document text
    • http://saimiri.name/upload/file/2317981503.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/tosojopudexarimamutawofal.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/599d7eb715dc76726cf61a19cc0e51e6/tajuzumebijuvabuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=think+and+grow+rich+book+pdf+in+marathiPDF 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_off0000c465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC465 20088 bytes
SHA-256: 7d8858d0a5a6e15c58edd03afa83a4184d312899da62c7ff424907ad545af2d5
font_01_sfnt_off0000f84c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84C 11000 bytes
SHA-256: 03eef8135fc791493a8ea622e77b0b9480681e0887e99999a1c91de2263f7138
font_02_sfnt_off00011146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11146 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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