Malicious PDF — malware analysis report

Static analysis result for SHA-256 6eb3c2fb78fa7094…

MALICIOUS

PDF

90.6 KB Created: 2021-07-02 03:20:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8a6dc727eaba5921234475415279f2f3 SHA-1: b993c658e04089a1534a4b7bd429609bd83e6303 SHA-256: 6eb3c2fb78fa7094705cccfb15d879a11e2d5fb74b21132bec7ec3bf93a6990a
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 websites or disposable domains, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest a phishing or malware distribution intent. The file's structure and URL patterns are consistent with a phishing campaign that uses a PDF as an initial lure.

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://chcial.ru/uplcv?utm_term=nobody+can+drag+me+down PDF link annotation
    • http://tatugigo.com/ckfinder/userfiles/files/98194315201.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/66228160544.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aac140c33e3---duginadogorox.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/ravona.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae9056f4fc---90471910918.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/13000831767.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8337c0bf8---37756997549.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/f63415b34e4c513266c008085fbf8caa/molono.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0423db0238---44100390497.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/xiwikaposewesi.pdfIn PDF document text
    • http://faradbox.pl/files/file/44876890264.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/89671671496.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/99832303796.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c84cf1cfd7d---tofogovakuzinulexuzi.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/4a340c53d7509afb35fc792d4e7be1f9/42290511065.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cfe359477---dofonirimegivilunedadaf.pdfIn PDF document text
    • http://oilandgaswork.com/userfiles/file/davixa.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160983935b0d45---29460667462.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/ripagulosifibemamo.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/zabafaxe.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/sidusupene.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/4b9abe5ad413475e04b6c12b6a45b697/gerilaxosi.pdfIn PDF document text
    • https://tavio.ru/files/file/zaxat.pdfIn PDF document text
    • http://pro.ovh.net/~tribuene/images/banque/file/vekazurebogigarupog.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_off0000fcaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAF 10624 bytes
SHA-256: 12e6011a4051c59f5de95fd88e113ef5fbb8d37c41fbd49d2e2f39a1d133ad46
font_01_sfnt_off000114d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D1 19676 bytes
SHA-256: 599c8ba4aba4d889c3f8ecd50e43c39767c03e4eee2a4f3402f572bbec1bce67
font_02_sfnt_off0001458a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1458A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1