Malicious PDF — malware analysis report

Static analysis result for SHA-256 a73633b467185f41…

MALICIOUS

PDF

100.0 KB Created: 2021-07-06 12:45:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 0477a0f64a2010e8e1ce339c4b1e3fd2 SHA-1: 4db18559cf66b8b0228b78a723dfde1c73dc8b5a SHA-256: a73633b467185f416308bddc6d7a9cb043b65ff6af389d0f0c4166541cf19b31
156 Risk Score

Malware Insights

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

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, directing users to numerous external URLs, many of which are hosted on compromised WordPress sites. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics suggests an attempt to obscure the true destination or leverage disposable hosting for malicious content delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9767

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://nomylo.ru/uplcv?utm_term=distort+meaning+in+tamil PDF link annotation
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160af91dd1fc45---lugofenaxetini.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/32940063779.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7f2d4c731---piveparomawekofiramufag.pdfIn PDF document text
    • http://mediaworld.pro/ckfinder/userfiles/files/1045936028.pdfIn PDF document text
    • http://nashcentralfalcon.com/clients/d/d5/d5bea9c86035def548a020f7371d19fe/File/82420362201.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/73179575766.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/30323200088.pdfIn PDF document text
    • http://arablift.net/userfiles/file/84622465044.pdfIn PDF document text
    • http://jaika.in/images/documents/files/7109619975.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/kbsg8ho91lkmqib41lnmlngp3p/99727117338.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/1c004c0aa1434527f642f4ab794ca1ce/womunosena.pdfIn PDF document text
    • http://cdhsalumni.com/clients/28864/File/bozitati.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/28924780910.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4c736de87---rozofafat.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/jizikumat.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/6c029851f06a318219a23feaf910c291/xamerogidiridujifok.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/25896590962.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a97ae2ac089---gefupidumizigegasad.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb501057b94---bizizavepurodinowizone.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074a0e752aff---zakokugotowagami.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097e9e356889---46814125483.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/paxexagazazar.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c19e3ffa8---wapur.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4d295523b---65770185900.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/5890688592.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000faf9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFAF9 18900 bytes
SHA-256: 8d5a7383ae3f3481282959deb9f474ef68aed2faac6dbd6946479f2f287d1724
font_00_sfnt_off0000e34d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34D 10452 bytes
SHA-256: b7783e0f85fbc225831282e7ddcfba56eb405bb2e49a9c1061633c0840d9c1cd
font_02_sfnt_off000119fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119FE 4488 bytes
SHA-256: 0d95053a0c8e31d093046e1bf49a10e6129c8a2cd81639aa28a8ffa5deb7fb91
font_03_sfnt_off00012a93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off000142a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142A5 25356 bytes
SHA-256: 0839e428318969ce47c2270e21ffd5968abae881094feff2f32a1975af78a878

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