Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8d36c845a52a71b…

MALICIOUS

PDF

100.7 KB Created: 2021-08-05 06:07:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 233491f235e4751346f326ba2400ad70 SHA-1: c59de1d33eb03120856cf83f855b3a378e6cf3d7 SHA-256: f8d36c845a52a71b38ee754a4e198bf09af19b800d0a3636c72899424dd4771d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Several heuristics indicate the PDF acts as a link farm, pointing to compromised WordPress upload directories and other potentially disposable hosting. These links likely serve as lures for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ee506e5b258---93043446698.pdf In PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/tasivamovomarowutozajixiw.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/dezokudotumuluwepikip.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b3216480c---31659201439.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/duzawipur.pdfIn PDF document text
    • https://jdlpartnerss.com/userfiles/file/suginixovokame.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/8535932519.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609840464d964---31391777586.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/1430650881.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/nomivotifutanapup.pdfIn PDF document text
    • http://generale-bureautique.fr/gdb/files/file/91885079215.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb157c98cd---lipugajopul.pdfIn PDF document text
    • http://vejwun.cz/images/lazepigokod.pdfIn PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/jufupudemas.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/93548727252.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/nqtdv226ketbupq6m7ttqg12f4/siretobekuzowafafimizig.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/figafolepid.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/7m65bt0gis4p66m85087ernsd4/30273541737.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/80ee5a4a7e4a1c97230af2887ec9c973/vajej.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/66092003444.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/76a730b86979e9d20f1b778a70d45cd6/livalesijisewivef.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/07jr5bbig45ronp2p0sim14jn9/82535280601.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c853df4682c---zomeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=can+you+look+up+someone%27s+licence+platePDF 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_off000125e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E8 10808 bytes
SHA-256: 2481efaa1ff1401aa6f32b7cb0ae5bafbb20e81447e7ff90efdb052e38f516ce
font_01_sfnt_off00013eea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EEA 16964 bytes
SHA-256: 5f735b3067fb081ad1cefed461acdfba86d20258f891b4bca19e27a92852e60c
font_02_sfnt_off00016b62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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