Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0239d4fc66697d6…

MALICIOUS

PDF

69.8 KB Created: 2021-09-26 12:09:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 666589fbf7c569d8fb7cbb7642aa71bb SHA-1: 3306f7b26e05b2b227b86e723f3e0ad4c3f60a82 SHA-256: a0239d4fc66697d60b8482d1d1842bfdd284d965b64dd758671e31c3d0a11eff
176 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains numerous external links, many pointing to compromised CMS upload directories and disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated and appears to be an image-based lure, typical for phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://crysiq.ru/uplcv?utm_term=advanced+engineering+mathematics+ken+stroud PDF link annotation
    • http://kreativitaet-stadlhofer.at/global/images/userfiles/file/55824501461.pdfIn PDF document text
    • http://timebymtm.com/upload/files/41543245717.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba58e21d88---94758425817.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/didavenoreseritagidusax.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210907185329.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614114a571996---36587122917.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/warilanoxelovasaxaso.pdfIn PDF document text
    • https://suacuachuyennghiep.com/uploads/files/resuduridog.pdfIn PDF document text
    • http://iltorg.ru/upload/file/25475089559.pdfIn PDF document text
    • http://grupafurman.pl/!mag2011/userfiles/file/12715253651.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/lezisegugabalexarox.pdfIn PDF document text
    • https://bliznacite.dvsportbg.com/files/6476721565.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210922173706_1022008695.pdfIn PDF document text
    • https://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/ludiramavojesenez.pdfIn PDF document text
    • https://dbhattacharjee.com/ckfinder/userfiles/files/runamixabidusatukisapem.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/pexigiwolodikuwebozet.pdfIn PDF document text
    • http://www.heksan.com.pl/file/sisumuw.pdfIn PDF document text
    • http://thienthaopc.com/upload/FCK/file/xizitu.pdfIn PDF document text
    • https://mimpishio1bet.net/contents/files/rivetevufutu.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/e9629fd7340062464a1c60c5e04900d1/wuxasatuzirujavinop.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/14256707602.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/jajojasikugib.pdfIn PDF document text
    • https://arhiapp.web-idea.ro/app/webroot/files/userfiles/files/xizul.pdfIn PDF document text
    • http://tearose-kitchen.com/sites/default/files/images/imcefile/28816041561.pdfIn PDF document text
    • https://luminex.pl/upload/file/zegomipegorugenarin.pdfIn PDF document text
    • http://gardensyellowcab.com/admin/images/file/nulufujovifuterasunu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB496 11008 bytes
SHA-256: 699bb642f1708ed82979a7a8e9f56d16b9bc34253c2eca0f6f68814898dcb267
font_01_sfnt_off0000cddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDDF 14056 bytes
SHA-256: 94d0caeff26fc19dd4a662cce3bf20124d01e68d42fa9284902a545750bd5898
font_02_sfnt_off0000f0f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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