Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea3a98b2fbeea11e…

MALICIOUS

PDF

71.3 KB Created: 2021-09-20 21:20:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f47a9b201d464046ea5aad470f5a1b87 SHA-1: 67b9f843bc9960ff84ce654086c3d9aa162e385a SHA-256: ea3a98b2fbeea11e2b8554bcbce9f7871c578d29906b2b7f25a0a4ed9019b809
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs extracted from the document point to potentially compromised or disposable hosting, suggesting an attempt to redirect users to malicious content. The PDF structure and embedded links are consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://climacom.eu/userfiles/files/59674804587.pdf In PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/10254285106.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/xetijapam.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/jetataforofimidexafiwu.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/66983388816.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/lopudugof.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/13998539406.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/mixok.pdfIn PDF document text
    • http://alkanboya.com/files/file///3790397377.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382d0e4f119---kukemarolamoruguvufizidex.pdfIn PDF document text
    • http://kfgame.snailgame.ru/upload/files/20210902084827.pdfIn PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/kunajisoses.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/77514689312.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614169316305a---porimafoguju.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/86704674905.pdfIn PDF document text
    • https://campfun.myhost888.com/upload/ckeditor/files/41931171917.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/siweb.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/0cabaeda1f7ef7d36be9d921e2c74804/12596023038.pdfIn PDF document text
    • https://mkserwis.pl/userfiles/file/17628091009.pdfIn PDF document text
    • https://oreopay58.com/ckfinder/userfiles/files/70842053482.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/vaxigugepovududukalitirad.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/96217204641.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/52196270546.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=russian+car+driver+3dPDF 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_off0000b5cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5CB 10484 bytes
SHA-256: 5a2f13ae3257fad0527093234cfff0cb1cac85e96c4a21d79102fae0307b4e1a
font_01_sfnt_off0000cdbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDBF 17240 bytes
SHA-256: 92b63b9afc521a6dd6e900832949cac0a861f8f4d1146c9b0f882262b82d727d
font_02_sfnt_off0000f843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF843 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1