Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a21ce2632e310dd…

MALICIOUS

PDF

72.5 KB Created: 2021-09-07 11:57:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 7333c05b1bbd3f5337aad10bef57129b SHA-1: d296822ba3877d693fc3e748b14b31bcd55dccda SHA-256: 3a21ce2632e310dd09e158725a31f1ff179414945f58f8dcad30af97a6be5d8d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised websites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The file's structure and numerous external links are characteristic of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://cructi.ru/uplcv?utm_term=design+patterns+basics+pdf PDF link annotation
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/232d052c207606e167923307496abd50/51840895799.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/21940026214.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a54968fbf---kekaze.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/gakidemivejevubof.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609658260d462---jidel.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160890e6389314---dedikopotawegiwef.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16129e46f2147c---raxikiwej.pdfIn PDF document text
    • http://splogservice.ru/content/file/57102967356.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/jaginamitatagox.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/75277855929.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/8ee3aa31bf2ee0218b64733f4e1ec03d/3818481591.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/besubewonipuzozabiwimuru.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4172bbc2f---87949721799.pdfIn PDF document text
    • http://songiadabinhphuoc.com/upload/ck/files/bolibivotuni.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/53bec112ebd03951c53f493e9f8a0b81/46321350892.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/vuxegogezipetawaxosavu.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/53fad693eddafff064f14a960e5cd115/lokujifiruxozogikanaka.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-6/file/viwefagenulodajek.pdfIn PDF document text
    • http://araonline.hu/uploads/file/purapogemuw.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/kimuroda.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/14892633669.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/86141551702.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/e0ecb34e4462b799c10ae9dc033a79f6/demepeditadopafipe.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_off0000bcb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCB3 15400 bytes
SHA-256: 508c4cbb5305ac5e97f372e19be76882354032752e7edcdd67845af8790c275e
font_01_sfnt_off0000e3d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fbef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEF 10772 bytes
SHA-256: ae4b6cd64b35e2516736b03840cb63d115590b33dc2b8acb24400047c0eb37d0

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