Malicious PDF — malware analysis report

Static analysis result for SHA-256 f331ab0901fb8bc8…

MALICIOUS

PDF

76.0 KB Created: 2021-09-21 01:01:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 207748ae691605e8731d6b77cecaa3cf SHA-1: 62d554f3f6b5eff4ce575ad01a32185ed77a3bf0 SHA-256: f331ab0901fb8bc831a933882cdb0dd67b109514782451104c90289ac39b8e62
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary attack pattern involves luring users through these links, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://accesoriosalmayor.com/images/userfiles/file/bekogetujulaxelan.pdf In PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/80546593208.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/tubego.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/vibetululofakalur.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/70361723105.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/kutunazosewepimezurapi.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/14375479293.pdfIn PDF document text
    • http://dalaichau.com/files/gadoguwunetivikamevomu.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/37711940251.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/70162236397.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/cf8e0c2bqo19dg0fv14jb75aq2/62965960126.pdfIn PDF document text
    • http://werkschoenenverkoop.nl/images/docman/files/nopupewelipiraxelak.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/bunedunapexukozap.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/7b29e60cec6048953ed6673ffac06790/80562815833.pdfIn PDF document text
    • http://sportingfoundation.com/uploads/file/liguxug.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/96068906753.pdfIn PDF document text
    • http://sparkpro.lv/content/file/paxisusilolimisinonose.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/52860299252.pdfIn PDF document text
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/30073473740.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161429fc172488---39127312601.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/fasijizeworetidojaxejob.pdfIn PDF document text
    • http://cmorshomecareassociates.org/uploaded_files/userfiles/files/64719928515.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/44467921200.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=the+giver+audioPDF 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_off0000c62d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC62D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE44 10240 bytes
SHA-256: f19422fa7d0b3a69c64ba46d73ff9b0341e9aeeddda897b88274abf3164313dc
font_02_sfnt_off0000f52f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52F 17748 bytes
SHA-256: b2c70e224a223783c2c7ef593615c5e537f611ae3e0a9544a05e0cdd9df3d0b4