Malicious PDF — malware analysis report

Static analysis result for SHA-256 30b052aa350d2af9…

MALICIOUS

PDF

85.4 KB Created: 2021-09-03 00:18:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 28f728faac8bd23b880eef55fb66a8f1 SHA-1: f463db245c41070591bc064a1ca1e26c2675a675 SHA-256: 30b052aa350d2af994c5c412c0c135ccd0a3364773d8ed422da1e4f9d1187aee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with numerous external URIs pointing to potentially compromised websites and disposable hosting. The document body is heavily obfuscated, preventing analysis of its direct content, but the presence of many external links strongly suggests a phishing or malware distribution attempt.

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://garglob.ru/uplcv?utm_term=telecommunication+industry+in+egypt+pdf PDF link annotation
    • https://soudurelauziere.com/upload/editor/file/mawor.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/48232868101.pdfIn PDF document text
    • http://cargologicru.com/sadm_files/notafapaxanamugajule.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607938c0e1873---zevap.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/065a4aa06ee434553bbb68820c42ab6b/fisoxatepako.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/56015183264.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/zekeworumorejax.pdfIn PDF document text
    • https://newline-eg.com/userfiles/file/87573909232.pdfIn PDF document text
    • http://aclamerica.com/customers/CMS-IMAGES/file/kewala.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/49231377195.pdfIn PDF document text
    • https://priscar.com/documents/files/xogugidotoropidada.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/76fuu9df65668p4a68si20eh42/fisasidupikos.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/56400211829.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f44e2cf0dd---2435208686.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/namum.pdfIn PDF document text
    • http://becucci.it/userfiles/files/jukixesexomek.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/19f782cb663e5121d592d0fc4270865c/mexinerojukodefabugiru.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/panesekizodesotasukov.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4734c74d39---nufovexakegadefolabunona.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16098dbb96f1cd---98615787988.pdfIn PDF document text
    • http://idcla.net/upload/files/86531816640.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/e93d1f8ac507f2502186ab880a12edb6/65519260831.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/491c7f3b6da8f3b35896a2b3e2d83eab/gojidi.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160bcba9fa43fa---87602599685.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_off0000e617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE617 17628 bytes
SHA-256: 2f8a9a8cbd3469a7e690c927231c509042c030e9e3e357aa98adec358846fbf3
font_01_sfnt_off000113f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F6 11140 bytes
SHA-256: b831e7b177521ed807c28b575dc9457a9cf5fe28f597366b21e10c86a7551b75
font_02_sfnt_off00012dcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1