Malicious PDF — malware analysis report

Static analysis result for SHA-256 c58481f9cee48918…

MALICIOUS

PDF

86.9 KB Created: 2021-09-04 16:09:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: dc5c2b85915c9f490c935c5fd3179223 SHA-1: 44740c740a1ea9e2c50b0524dabea08402b3873c SHA-256: c58481f9cee4891839a3391941b03d682e73432723514f3ced5578c7824daeb4
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, directing users to multiple compromised or potentially malicious websites. The presence of numerous external URIs and link farm heuristics indicates an attempt to distribute malware or conduct phishing operations. No scripts were extracted, but the structure and URL patterns are strongly indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/7551a7b937b47131abe7d6f2cfc561ec/musijafosiko.pdf In PDF document text
    • https://accounting789.com/ThImg/file/limuzirilaxafolunelixata.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca24aaa884---85368325789.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/3974032756.pdfIn PDF document text
    • https://asfus.net/virgsurv/userfiles/file/zenam.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37747545466.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/456ad399a7797b236c32d774fa84170a/rutuzapivumezosoxuwowifa.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/fokubobubowukusugufixilu.pdfIn PDF document text
    • http://dtcguild.org/clients/80367/File/41551333368.pdfIn PDF document text
    • http://cpviettin.com/upload/files/jiserapilawaja.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/73047004263.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/jilulotopup.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/835691893e31977cb3c58815c366013c/pukalevo.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/xatusujalobawazuwu.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/10607222394.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a7833602321---mekamop.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a130bce30---20262744477.pdfIn PDF document text
    • https://mimpishio2bet.com/contents//files/sazubesas.pdfIn PDF document text
    • http://www.siposferenc.hu/html/12771029390.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/kivapixuwugul.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160de5a42228a1---manivazifusilobapet.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/rotigaxojozutarotebosul.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a34968a31b0---87320289860.pdfIn PDF document text
    • http://eaeocs.com/clients/c/c7/c75ed17bfa54634cfc1039f1b599a7e7/File/65451292331.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=miele+complete+c3+brilliant+manualPDF 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_off0000ec39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC39 10772 bytes
SHA-256: 680deaf0845101afac8d59bd00af976765b4b99a6c28d85514712617e906ff9c
font_01_sfnt_off000104c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C5 18720 bytes
SHA-256: 35a8216b28b493dcaec4e0d70cf0f9ec44ea7631614b80dd16d400a004793390
font_02_sfnt_off00013589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13589 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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