Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2f2750d3fb66bcf…

MALICIOUS

PDF

75.1 KB Created: 2021-10-04 10:07:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ee59306b695265aacf7357c3aec5435b SHA-1: 07f9bdc81a77f6f01a494c6c695fe628a1ccc771 SHA-256: d2f2750d3fb66bcf141aad00065ff8548679a5f25e444a15e2ab1212d398d011
196 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised CMS platforms or disposable domains. The heuristic 'PDF_RANDOM_URL_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a pattern of distributing malicious content through a link farm. The ClamAV detection and ML classifier further support the malicious nature of this PDF, likely used as a lure for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://lmtechsolution.com/userfiles/86976225939.pdf In PDF document text
    • http://petra-koparki.pl/Upload/file/14381398827.pdfIn PDF document text
    • http://baovecongtruong.com/upload/files/98275590034.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/57217217376.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/17585370282.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/79491727534.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/rotusut.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/58653848896.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/20219221550103244.pdfIn PDF document text
    • https://lesrimaudieres.com/images/uploads/file/kabuvudonukudurezidado.pdfIn PDF document text
    • http://markone-tools.com/upload/files/bizis.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155e54fe90a1---kivijirekevev.pdfIn PDF document text
    • http://citysoupsbellevue.com/uploads/files/47487066408.pdfIn PDF document text
    • http://elektro-galerie-hamburg.de/userfiles/file/82929136856.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143907f2bc72---35889079156.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/55199137351.pdfIn PDF document text
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/pusekikekupu.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16159452e57293---dutopafebozoxujumosipimi.pdfIn PDF document text
    • https://partnermind.cz/images/files/55741435383.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=racism+in+conrad%27s+heart+of+darknessPDF 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_off0000bc1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC1B 19184 bytes
SHA-256: 9e9242ec153f7475ce550c554b30a9854ba1721e16ce7e6ddc39482f2303ce4e
font_01_sfnt_off0000edbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBD 10868 bytes
SHA-256: 09e218ec0bae5751102e6ff7dd99597502008d40a67189b85a23497878778ef3
font_02_sfnt_off000106bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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