Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5ec883cc06c3402…

MALICIOUS

PDF

73.0 KB Created: 2021-09-08 11:57:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 407124cfc13b2c694c2246a4629585ed SHA-1: 35b392bb93518b6278740ef95321ad032f2092ff SHA-256: e5ec883cc06c340218f8b15ccc7d4d12c73bed7d6889093af0c2f23bde65a5b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing lure. The document body is heavily obfuscated and unreadable, but the presence of numerous unknown URLs indicates a likely attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16128ee8cbb715---33904581196.pdf In PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/bopituwigotuduzani.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/muzabunilotodawade.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/7168b51318614e0918fed421e8d19ef4/tifiluwifeji.pdfIn PDF document text
    • http://willbramephotography.com/nuwemib.pdfIn PDF document text
    • http://saigondome.com/uploads/userfiles/file/mosevawoxepurenase.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8d94cfe47---tujamoruji.pdfIn PDF document text
    • http://synergyproperty.com/images/files/20201735346.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/19128784213.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16082c682ef677---56433893918.pdfIn PDF document text
    • http://bacsionline.net/userfiles/file/95524042750.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/vezilakipamu.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746c509cb71---40233435465.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a86a90aeff---wijigigitotukobawazanijex.pdfIn PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/vedituxovuligoropedikajif.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/71257207439.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210807180608.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/59920402337.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/vamutivam.pdfIn PDF document text
    • http://westpakusa.com/phpsites/vertical_living/uploads/file/70132801581.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/raritarozevaturaru.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a8eea92d6---dujufemod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=character+certificate+download+pdfPDF 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_off0000b3c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDC 10664 bytes
SHA-256: ac0a674f9dcd0e551c6f0df5fbafc4b0ff1a7177f5c6bb33311b7cf86420cad0
font_02_sfnt_off0000e44b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44B 19860 bytes
SHA-256: 0e779c357e42074c991681332a618b1e35a76bb0156497bbfb50ac880769e728

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