Malicious PDF — malware analysis report

Static analysis result for SHA-256 6406564ffa4610de…

MALICIOUS

PDF

80.8 KB Created: 2021-09-05 15:35:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 911656720ea0ccb1adb23538bf044ebf SHA-1: 11fb233dbd987de6d64f503e875bc89cf14452a0 SHA-256: 6406564ffa4610decd9f0784f139fb35f29f3de2d33682cf455acc2359d3e8bc
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, likely intended to lure users into downloading further malicious content or visiting phishing pages. The presence of multiple distinct hosts and the structure of the links suggest an attempt to distribute malicious files or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/3618adeeec1cf16e9d6c7cc8321a449b/fijokuluxamevazovavor.pdf In PDF document text
    • https://prosaison.fr/userfiles/files/juperinaxudezijazawumoluz.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/89d366c5b5b5762a8ee2a9fc4c9cc68c/wisopekibatute.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/9b34788cd346936fffb5e7ba6520c681/6227591435.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160d06844c4dd9---guwaretemoximuxam.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/84c50802ddd971b27e8569de1ec71e74/kafogosije.pdfIn PDF document text
    • https://susta.vn/userfiles/file/zasisiwevovumifekepavesu.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0eb661b8f---pimesu.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/58696933949.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/66792367552.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/85475815956.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/1785f37f3af1272db8ee556b7fa769d9/laxalofemeravevigoli.pdfIn PDF document text
    • http://cjatkinson.com/userimages/85734530364.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/48567548ba95428d7fbc3e07574db1da/22923839920.pdfIn PDF document text
    • https://pellevah.com/upload/files/67507970346.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/b0c127c2603d6329b0477a8dec810803/13176954791.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611bde0975935---19099875128.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/zenimilimuxefegolafu.pdfIn PDF document text
    • http://chixue.com/uploadfile/file/20210707101103.pdfIn PDF document text
    • http://conditum.nl/userfiles/file/zurolulap.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/tofofifizo.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7782369a80---xugegutivosimonumigif.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c0775d40de2---58202515037.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=multiplying+binary+worksheetPDF 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_off0000d648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD648 17540 bytes
SHA-256: f9d66dbddcdf42053d0286902064209ed9fcc69ad3cd73c16ab6a2b6d523754f
font_01_sfnt_off000103fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C14 11056 bytes
SHA-256: 8724af69d394e107eab71df45b227ea5ba2764647c4824a8d90cb96ef019f2c0

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