Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3b060d9d8d35a33…

MALICIOUS

PDF

82.1 KB Created: 2021-09-01 16:16:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bc595077512a6204d062701388377174 SHA-1: 7fa6000b6501162528ffc6086309adc3c909c222 SHA-256: f3b060d9d8d35a333d87a5ac76efb7e2298b0b914c3d22f1decb0fdb426ab218
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF sample was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains numerous embedded URLs pointing to external sites, many of which appear to be hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' reinforces the malicious intent of directing users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://oniceh.ru/uplcv?utm_term=the+view+giveaway+2020 PDF link annotation
    • http://www.scsk12.org/policy/files/files/38673965314.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/85d197c34afc2e33b02040333a0e8acf/6244682194.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1610bfa5f2adfb---xudof.pdfIn PDF document text
    • https://sca-kc.net/scauserfiles/files/buleb.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/tv537666urdip714b7ph6tuh12/gafetesatufurupekimipuluz.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/3133178801.pdfIn PDF document text
    • http://cy2hand.com/userfiles/wolamesu.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16100ccb6862db---62360470618.pdfIn PDF document text
    • http://sbairs.com/datas/files/fiwigexinomomagawon.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/87263350041.pdfIn PDF document text
    • http://tulga.ru/editor/files/79878412051.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/38333180988.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210709_AD47916B29D491AE.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/sifedovud.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/lcm6tq7cvnde787jfb2oj3qcve/misagoteravi.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/90590991884.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a17ff671fc8---38911560583.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/pazeditelapiliveg.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/bazipujeze.pdfIn PDF document text
    • https://dacola.com/upload/files/98733634312.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/284545777.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/fuxapuwikibizodujepamajiz.pdfIn PDF document text
    • https://postelezmasivu-plzen.cz/ckfinder/userfiles/files/tijurekujudajonubeweru.pdfIn PDF document text
    • http://fteq.ru/files/file/35347719105.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a3042a1c3---18715858120.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_off0000dc37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC37 10220 bytes
SHA-256: b9fffa34733ffde5a03bb321bc4059f4064c0d6cb788ef593050e905c8aaaa2b
font_01_sfnt_off0000f36f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B81 18128 bytes
SHA-256: 6f8ee9b1cbfbbc3a1ea6c66684441ff8e87d1fbc5729b25871d185c21db39bea

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