Malicious PDF — malware analysis report

Static analysis result for SHA-256 934b73d6aa548e8c…

MALICIOUS

PDF

84.3 KB Created: 2021-08-02 11:08:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 65722b4cd2830241dbd64dd99104a1c9 SHA-1: ec0b07724f20069ba6209637d2ee875394f0a18d SHA-256: 934b73d6aa548e8c67be419f86ea37beb4aeed6e0edd40b2cbc366df1ea70e44
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised WordPress upload storage, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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://synerhu.ru/uplcv?utm_term=unable+to+detach+or+bind+xrefs+in+autocad PDF link annotation
    • http://arniuniversity.in/ci/userfiles/files/73050559059.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/16084034039ac0---17332878806.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/75096414366.pdfIn PDF document text
    • http://pjcwyy.com/upload/file/9942187942.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe204c6620---juxivukokekafuvamu.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/ce9fc984de5b7bffb9a91ea3138ef102/sobaxogebabemibuwemebelif.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/dinavibegeloto.pdfIn PDF document text
    • http://myredm.ru/uploads/file/pijijinim.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/babupenetixomidop.pdfIn PDF document text
    • https://retta-bg.com/userfiles/18556347734.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/xasadalale.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/rekunajodovoleten.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/41092399641.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9dcc044c5---towewivakuvurunifojobawaf.pdfIn PDF document text
    • https://patidarpalanpur.com/web/k/main_admin/ckfinder/userfiles/files/34961407512.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/7483297307.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/85783598770.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/58994641125.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/89194261136.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/f049e8f5f2afcd40fa4fa669a092fd5a/47782410771.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/p6872kss1ntp7ut1peoepsasd2/38924234214.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/91534721728.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/nirilexoxob.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/0a05bd173d85d33015ed3796357a7b19/95022008802.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/bdad174c6591b53b0b4b6f217a9c7026/58800725456.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809ab50102a---84833490401.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/48fbca8cd3dc4a8a269b1c990a317fcc/26229074623.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A4 18196 bytes
SHA-256: bc2fc8fa29421aa23e2591556dd0e8e70df5d3968cabb9838df9975272312436
font_01_sfnt_off00010502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10502 2296 bytes
SHA-256: 0d91b93c30cdb4b9fcc5287ef31e0f6d3b75050094e35c3303e90e7f2c1d387e
font_02_sfnt_off00010f02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F02 10920 bytes
SHA-256: bcbffb68a34b7c11f1992b2bb3fe7d016aaf40aed22ae393b92c80c0cae388e9
font_03_sfnt_off00012840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12840 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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