Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cd0b4ecc61cd171…

MALICIOUS

PDF

93.6 KB Created: 2021-08-13 19:56:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7191a0dccec673cda8d7164e1acc3194 SHA-1: b5a2b8ecb1aa80b333c217c15907aa278ee58c39 SHA-256: 1cd0b4ecc61cd171c636f29157a77d8f529ad858534d6007d233b4792f609a24
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting it functions as a link farm or redirection mechanism. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://ketchas.ru/uplcv?utm_term=step+1+dates+2021 PDF link annotation
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16098636cb9cb0---99183323335.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/219d254e8a01da1f488679b1c49590c2/98234347448.pdfIn PDF document text
    • http://furniture83.com/upload/files/jonujuresoro.pdfIn PDF document text
    • http://granite1962.com/clients/869125/File/39166169650.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/mepeluv.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609283498305c---92597988355.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b38ec5a5d22---gudorunogete.pdfIn PDF document text
    • https://nevisnews.com/userfiles/65521287089.pdfIn PDF document text
    • http://kwartetproforma.com/userfiles/file/61252254178.pdfIn PDF document text
    • http://carefirstyoungatheartgala.com/clients/b/bc/bc61c41cf33a111e4089ebab1e34a2ce/File/64255762124.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4c2f17712---luzinavazepanubuturavo.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/ca5dd67d44a1e8e26cbf74ec176ef3c9/21153550602.pdfIn PDF document text
    • http://greenld.com/userfiles/53367941429.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/96880423201.pdfIn PDF document text
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/kuwewivumudarewaxeserivum.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/bixebower.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1c4b59135---sidekivumufi.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/lepovawokinavagar.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c10e3a45261---zegupurawutotekokuleb.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/16927961302.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/erko3dcsdn8ogl0ijvmi13uen3/lonijisisenazefuzubigoz.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bab78e46f60---furobuzisog.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_off000109b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B5 17288 bytes
SHA-256: 8b8a67c8e70f487e0504238bfeb4db004b5b0315b8477f6062dd574c5cc9f28f
font_01_sfnt_off000136f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136F6 10292 bytes
SHA-256: 10ed952209392869638b7b7a9de374721bad4553c5e04a13fb2a6f499d40d4a4
font_02_sfnt_off00014e57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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