Malicious PDF — malware analysis report

Static analysis result for SHA-256 386c378d1c3b86c7…

MALICIOUS

PDF

81.9 KB Created: 2021-06-23 06:18:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: aecea2a8f0ef1d40cb05cd3f06e8f074 SHA-1: e09b63c4e51ac4d425acba67590a35197187f16e SHA-256: 386c378d1c3b86c70cd931e71300eff84bf188c6fb53d04ee796928548af4385
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/rj51a6qt76an6kudmgsr8rubqa/jenijenudu.pdf In PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/2h7h8eq1a20k8ndu8bs1r3oegi/71552074311.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160927b1fd1195---12756835298.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/tasipopixofuwozinal.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/51254473556.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/a4871b6bd6b41c2ac8527f2331247a7c/sopunabewuzi.pdfIn PDF document text
    • http://verdantnorwich.com/clients/3/30/306756bb587dffcd11ca74610d845a16/File/80346741373.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c120031e5fa---bulewekemapefun.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0648d9cdf---85287520122.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089ab6f62408---20037155701.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/c825f91b12991eb542f607e277504fa1/3837244870.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4ba4c3b96---likeg.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/rafodujuzozotepabi.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/wumujitapifufumerodimu.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/fubilazivefuketafej.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=santoshi+mata+vrat+vidhanam+in+telugu+pdfPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f23e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23E 5616 bytes
SHA-256: 1c8c2037ba46161313221a0fa7125f8ce7c8510988a35935a02d91b262057552
font_01_sfnt_off00010532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10532 11352 bytes
SHA-256: fad509b408620f73e795f7fdd38837a89ae3a2934b1b6e291937377e43711e61
font_02_sfnt_off00012afe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AFE 4156 bytes
SHA-256: d5d7139ba7157182538285dc1880f6c0211cdec320b53c90867cf23a00b7b408