Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb56af72ccdd054e…

MALICIOUS

PDF

79.1 KB Created: 2021-09-22 17:49:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4b7d37a9139a71bb3ad4b46fa2759e74 SHA-1: 6aa12b505077ad630ee1a62e419c9ba76f133a42 SHA-256: fb56af72ccdd054e1dc691b8539c82b1ca1daac9824b15a953236e4d29cbad5e
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting it's designed to lead users to malicious content or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution through these links. No scripts were extracted, but the link farm nature is a clear indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://medvor.ru/uplcv?utm_term=art+of+war+hacked+apk PDF link annotation
    • http://matrix-corporation.com/upfiles/editor/files/xolapukabuxugazos.pdfIn PDF document text
    • http://ryukatsu.com/userData/board/file/47955653625.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/49783241622.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/c862401bda609d6aa09d827e2d537e52/24134811618.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/89699ec77b9b2d95db2fad11f52babbe/40381386495.pdfIn PDF document text
    • http://hnsunnyfood.com/d/files/zaferexobofawisotipibuk.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/13234300442.pdfIn PDF document text
    • https://portoggitter.no/content/files/userfiles/file///xirid.pdfIn PDF document text
    • https://theurbanthinktank.com/files/jiriwux.pdfIn PDF document text
    • http://rayanchem.com/d/files/93690343230.pdfIn PDF document text
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9644794928.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/pixobudafanoradi.pdfIn PDF document text
    • https://hawkseyetravels.com/assets/ckfinder/userfiles/files/9677308557.pdfIn PDF document text
    • https://iohrp.org/f_files/files/pusulolupugasutoxuzojig.pdfIn PDF document text
    • http://karthikeyanjayaram.in/userfiles/file/59924856660.pdfIn PDF document text
    • http://briztravel.com/upload/files/gejipugenejovomovumoti.pdfIn PDF document text
    • https://pmms-online.com/assets/file/feliwogifedofotivagobadi.pdfIn PDF document text
    • http://josquin-capella.de/download/jovewafemimunodumi.pdfIn PDF document text
    • https://coaching-jk-academic.com/ckfinder/userfiles/files/midamap.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/59360721418.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139c98e38d99---41604228009.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345d4b6e3ea---newanexaduzozuvur.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_off0000d170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD170 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE987 10464 bytes
SHA-256: f629b9aca5b8f8a56cf12fd4fc0ba8a4edc7686ce091e177e2933f2869fa5485
font_02_sfnt_off0001018a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018A 17372 bytes
SHA-256: 5078f4697f829b0039008e30f67ec4e200b577c545a7fd1ffa089aa223d16b9e