Malicious PDF — malware analysis report

Static analysis result for SHA-256 3af8e789b91a1df8…

MALICIOUS

PDF

104.7 KB Created: 2021-09-10 23:51:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 906bd87f42c814d1fb3cc7fac902590b SHA-1: e8aa5c9c2b0ec1d2d45a6d0d25359c78bf8cee81 SHA-256: 3af8e789b91a1df8dbd2dad6275d12434197cf6fc6b82261f984fd90f0f4fab2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. Heuristics indicate it functions as a link farm, potentially leading to phishing or malware. The 'SE_PAYMENT_REDIRECT_LURE' heuristic strongly suggests the document's content is designed to trick users into making fraudulent payments or divulging sensitive financial information. No scripts were extracted, but the PDF structure itself is used to host numerous links, likely for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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 http://techbico.vn/uploads/image/files/tupivesidivosemi.pdf In PDF document text
    • http://arsvet.ru/img/upload/jorarotudegabot.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/tuvaz.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/momibizofis.pdfIn PDF document text
    • https://tectrongim.com/uploads/file/juxejuvuwarex.pdfIn PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/mibezofitejed.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/da95f326292f77000aae09374895b839/70220279276.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/90115360241.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b067870310---6320116501.pdfIn PDF document text
    • http://akcihlar.cz/userfiles/file/polatixilofasijab.pdfIn PDF document text
    • https://malmospelmanslag.se/userfiles/file/tekezudefasi.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/8095326378.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/80474191473.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/17m6m2ers9v82lvmh64eig8s5p/zavokodiwuvajekanimoziluj.pdfIn PDF document text
    • https://bellcera.60km.com/upload/files/23310582828.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210903200959_1964858913.pdfIn PDF document text
    • http://midel.me/userfiles/file/razotuxevimew.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613329ac0ff50---51427018709.pdfIn PDF document text
    • http://stisk.com/file/20000248475.pdfIn PDF document text
    • https://kingdom.vn/userfiles/file/jidifujuwa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+remove+photo+from+music+player+in+androidPDF link annotation
    • 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_off0001328f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1328F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014aa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AA1 18240 bytes
SHA-256: 60e145590ddf40ab0a01ca0dc1f7dc752c6201ad029dc21f91ded142f051ccfb
font_02_sfnt_off00017aac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17AAC 11244 bytes
SHA-256: 24140cddd8eca5d93e299a9a86d90c1c7aeed18974bdc837893a952af750d7e0

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