Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc86500c16bb06cc…

MALICIOUS

PDF

96.3 KB Created: 2021-07-07 01:22:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 68d35fcc13b04ef1847a8f2783799abd SHA-1: 2c0ddea40d372d0fdedba2339b89b0fdeaa83c80 SHA-256: bc86500c16bb06cc9f38d2c4383b75978ef6ce4b6b0a9969b53d726c21633544
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous other PDF files hosted on various domains, many of which appear to be compromised CMS uploads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure and URL patterns are consistent with a malicious link farm designed to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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 http://www.awakohchang.com/image/upload/File/4853705002.pdf In PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/10330075614.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/2762534818.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/93959588584.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-5-7/20210507130408493431.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/5ac649213768315d6680712045abd407/68753789142.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b74a2231bbf---jusujitewivapavonerubumo.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/ravulezizidubofitusojuto.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/32135986724.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/wekus.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/loxafozewodudenurazij.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d7289baef---72550493060.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/mobukisirenegudiraf.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/xagalenixixisokapazexefa.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6877447248---61992773760.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/tikejunazawovugu.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ffa235a82---fotolasowavivinuj.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/11089937133.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/9a8a6b7e5d260f813bf747fea9dda9d8/rezezibu.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6471ecf36f---zowejala.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/67397189670.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f51e3ebd4a---37377217740.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160799eac8c1d0---winobotuvetemokajaxiwevu.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/6658438451.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=bad+red+hairPDF 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_off000118eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118EB 9860 bytes
SHA-256: 6d9c48bd3f1b88cf03812b13f7bb9b5909a1a11e5cb4fdc6ec77d0834afe359e
font_01_sfnt_off00012ea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EA6 17416 bytes
SHA-256: 495753b770d30af23eb4a466ed426082b9ab7e5921bbc268342de1882e914175
font_02_sfnt_off00015c46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1