Malicious PDF — malware analysis report

Static analysis result for SHA-256 67b3846a21672d98…

MALICIOUS

PDF

80.2 KB Created: 2021-09-10 15:16:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 87381b689d2091e6dd51c51a00e19bbe SHA-1: d0e4e3086d1f83a544ea950902fb4929d91e617b SHA-256: 67b3846a21672d985e05e79c6c0332362b34a2788a2e56bba957e0a38b6d3fd2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating its primary purpose is to redirect users to external sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://drafthe.ru/uplcv?utm_term=angry+birds+2+download+android PDF link annotation
    • http://twtqedu.com/userData/ebizro_board/file/79298435874.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/c6a993e7e4e9193a34867fa1ba60b002/5152100597.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/kigasowunamop.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/8447710007.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/72383642601.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/bn28sukhslkivalmu02qgrode4/34720129842.pdfIn PDF document text
    • https://nileagriculturalindustries.com/file/54316312941.pdfIn PDF document text
    • http://idroter.org/userfiles/files/fijanejajegipo.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/tagozexobabiromarizepo.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/keguriwila.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/65dd8b171806b3f3031c58db4850514d/toribunetixakix.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/26010654444.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16133c0e01447d---wosupebipuriwuferebanemo.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/vezekabijojepita.pdfIn PDF document text
    • https://j26clean.com/upload/files/20655182113.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/25859764653.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/wuxagovezax.pdfIn PDF document text
    • https://afgventuregroup.com/cfiles/file/zosamivivideninu.pdfIn PDF document text
    • http://jjc-dev.com/userfiles/file/9646385210.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/tetaxet.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136fdc500cb1---56954108551.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_off0000d561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD561 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED78 10636 bytes
SHA-256: 5dc03f567d4531c7e97a9a3c3c6647c2b7c5c35d800b9903c0849678d179fbf0
font_02_sfnt_off000105c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C5 17684 bytes
SHA-256: d92b90e2bc9d94f56af7899d9a78d1a0ef96881ec1185fea1fb4d0c7474e4c60