Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3d0d5a133ea1496…

MALICIOUS

PDF

76.7 KB Created: 2021-09-18 15:52:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d4a23794e45cb06a5cfded613307257b SHA-1: e01241b7538bbc69fbd200f0507d10b2904e4351 SHA-256: b3d0d5a133ea1496cc40fc0a30fc506cc5540c2e7e5be6da8ad6e587f7a17493
176 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised websites or disposable domains, suggesting a phishing or malware distribution lure. The heuristic 'SE_CALLBACK_LURE' indicates the document may also attempt to trick users into calling a fraudulent support number.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://huntic.ru/uplcv?utm_term=shoujo+city+free+download PDF link annotation
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/24331992023.pdfIn PDF document text
    • http://reckdance.pl/userfiles/file/vinomukegepenosaga.pdfIn PDF document text
    • https://vendax.ro/files/file/zajirimil.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/q9tmj2u0cjhogmca4nlaq2jrv0/98797265495.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/63329179742.pdfIn PDF document text
    • https://www.educazionesessuale-scuola.ch/ck/ckfinder/userfiles/files/97803364772.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/vukotexuz.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/sekopisafikizej.pdfIn PDF document text
    • http://zhongyuemedia.com/filespath/files/20210907200911.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/95381292727.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/95219286236.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16135b1198f4d4---9408774113.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/11953001832.pdfIn PDF document text
    • http://sanraimundo.cl/dyn/uploads/file/8712657695.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/72506147799.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/2521326e83c4c31b5c55d3bf91cf6d0c/39878809360.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/redavobabaxebe.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/gorakafatapepumolukibi.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1613400903a9ec---tujolesafewawow.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bec8d8170e---sepukivag.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc4be4c65b---88740032984.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/ligeduxoweladivigataf.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_off0000c3b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3B4 18516 bytes
SHA-256: 8ef1089a36219bc832defcf59a6b40b480235312c244ad40d3a68f287d8f292a
font_01_sfnt_off0000f421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF421 10908 bytes
SHA-256: c4d58265b32c550f8ad9a6cc78c995743fdfeb6616d71818ca9b846a264ae1fb
font_02_sfnt_off00010d66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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