Malicious PDF — malware analysis report

Static analysis result for SHA-256 d94838a70a07c0f1…

MALICIOUS

PDF

91.8 KB Created: 2021-07-20 15:32:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 60ccb9f0418925d96eb20b12d259a9cd SHA-1: 9a21545b87d269dc3e6d7f6507f43d7cc5532e56 SHA-256: d94838a70a07c0f1f7876c06790272e1b25c825ac1e1f727bd85cb85f0774338
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to distribute malicious content or manipulate search engine results. The document body is unreadable, but the heuristics indicate a malicious intent related to URL distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://west-holding.com/userfiles/file/24046236867.pdf In PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/11557257812.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/xagotum.pdfIn PDF document text
    • https://www.explosivo.gr/wp-content/plugins/super-forms/uploads/php/files/8a3a3065d3b6b4b994607c437288d28e/95387258510.pdfIn PDF document text
    • http://chapelguild.com/images/usr/josukevaruxuguvinula.pdfIn PDF document text
    • https://destockbaby.com/ckfinder/userfiles/files/kobitipoladefifisiwakoxu.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/68262832279.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083b549d67bc---15274644819.pdfIn PDF document text
    • https://lncl.org/ckfinder/userfiles/files/76701531081.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607895b622f1a---vivudezobijijidozamepawa.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zubugobixunakodukuwibiz.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/i7vek578kmp8cgj2a00agaokvq/dujiminoxutetezujadu.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c22cfb5cb0d.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/18186841683.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/jur6msr5v5odev19ercptekai2/pomaduwovunijurok.pdfIn PDF document text
    • http://szalkasszorutacskok.hu/app/webroot/files/content/files/18753939175.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16096104ad248b---fetipidizavogupipilad.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9832aadf30---3467910094.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8ccf3589f---dimovetaxo.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078abbce76e0---kumakidufoxusakijuja.pdfIn PDF document text
    • http://regcureguide.com/files/files/nedetozewatuzefebuberi.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073bf9a83fd0---verekakesiwudazipek.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/db95c03ff6aef90a83f100bd5e9b24c6/mebaxejosexijafejeb.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/ub6ksjktkg47hrqadnls9h4kjp/79397447453.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/birezenasipat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=80+loan+to+value+calculatorPDF 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_off0001026e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026E 10364 bytes
SHA-256: bacc17b08e06c4aa8b9679de043e37686b2c211a228f12c0c44e1cc83988f210
font_01_sfnt_off00011a02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13214 17484 bytes
SHA-256: 43656be15fedf0557c74ef84435895bfbdf2a8608d5e583c00dcc776b899d568

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