Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e49bdb1d819e662…

MALICIOUS

PDF

87.3 KB Created: 2021-08-16 03:51:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a0c9aad39989967b922bba5e412aaf79 SHA-1: 82322f596129bd67d14845f08434758e53ce95db SHA-256: 4e49bdb1d819e66261697dc325024d3103f3596e6c6d46c24e1c4f73a200b612
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites and disposable hosting, likely to distribute phishing content or malware. The presence of external URI heuristics and link farm indicators further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://oniceh.ru/uplcv?utm_term=sportcraft+treadmill+owners+manual PDF link annotation
    • http://xn--eyt274i.com/upload/files/68616685813.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/kudarovuwewoxizawog.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/77732749980.pdfIn PDF document text
    • http://vhs1962.com/clients/b/b9/b967f936f519796c2a696a6ed1da67f9/File/wujusolorek.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/92lun1oto1ii5iblh1443upq4t/vinidi.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607aab165d410---bivomulumakowa.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/5485d2f143b55a608573e8f10f4559f6/sosajukojifipazafu.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5b2375de3---setigixukelowewagupir.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/pefigoledub.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/nugopizamekaruto.pdfIn PDF document text
    • http://ahs1968.com/clients/d/dc/dcea35c349c70fb55dca458fc6558ff6/File/madazoliv.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/60361172058dd0a98a2b4243b3f3d908/fowusakonewigiwer.pdfIn PDF document text
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/ruzowiwe.pdfIn PDF document text
    • http://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/14259144129.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/4a3ed39729e65e8aa14c60d67e43e40e/38379531505.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/b398e532859996e9b12f2e2dce736412/92483585462.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c76ad894afe---99592328520.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089c55c39f2d---zopijubuduto.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/210488e873b1a6dc9b2828ccfcc82b14/nigezelutopifedazadot.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/rigazewugakezon.pdfIn PDF document text
    • http://kotolantopeni.cz/file/datowiwinozavemajazi.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/eb138fe4b2cbdc0f33eb9a2ff23783ba/ferirabo.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/4f5b5339a6f0f23afbb86612b9c8a892/79403599134.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE763 16964 bytes
SHA-256: 8143a6f19f0a90c138b14bfd92e1e034cab7e2671a3476eb026a57a999b8d764
font_01_sfnt_off000113bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113BC 1864 bytes
SHA-256: 3ae51fd610f93fda52280d3587598879eb616076db170d3bcf8e16b1a7bbf2ef
font_02_sfnt_off00011c6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13486 11040 bytes
SHA-256: c69b7b4cf1847ad6232d3af085d0db204785042830b3eaac82185d99145de769

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