Malicious PDF — malware analysis report

Static analysis result for SHA-256 20b7cb822ac218fc…

MALICIOUS

PDF

79.3 KB Created: 2021-06-23 11:30:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 415dee2299b017b256f6ff18c68b3e88 SHA-1: e42cf6ecf51b82a44333b2b1de481cb7c367ffc2 SHA-256: 20b7cb822ac218fc2f4d64d582a85463b46945519d32499fea4bd15d795007fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous URLs pointing to compromised WordPress sites, suggesting a link farm used to distribute malware. The document body, though heavily obfuscated, contains keywords related to downloads, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://huntic.ru/uplcv?utm_term=ldc+rank+file+pdf+free+download PDF link annotation
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160813b20d2818---jexebixekadefikusawu.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/sujurawag.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a4d4c98fd---zobimozoguvaginonu.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5a0219e23---vulugojaxomexikobel.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/3584ec7ba0f1e33143cda6d280a6d724/38371540194.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/ln9msh0jvj9ge3f6uaru7jjk18/tigog.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/zuxoniketi.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/musutatatame.pdfIn PDF document text
    • http://banghaija.com/userfiles/file/12875025376.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/91045947086.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/bumuvijewuxizazowavi.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/vawixejexutozesowu.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/bn23os2fm18icosv3ipevbea4u/nabojiwajojudufilarebufa.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce6607e3c8---xipowegutuxusewoduwutiki.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/frrua0mpb65h1jv8k2lb3guc12/57611195405.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/8900fcdfe524d3c075f2d4fa7da883b6/bofaxunomagesa.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/oi640e2r2v40bp33qpfobl15f8/sewozosasabu.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/kososavonin.pdfIn PDF document text
    • http://rubensova16.cz/files/file/88527989471.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF823 5068 bytes
SHA-256: ba3f5cd6b5ccbd63577d370cd91438b302778009fd54f726de83828bc4347c7d
font_01_sfnt_off0001098d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098D 11528 bytes
SHA-256: 50453321539cf75d725e81f722e5c568de3ab5dad6147bce8d8fc792e5e36e17