Malicious PDF — malware analysis report

Static analysis result for SHA-256 c85c8c0da0546dc8…

MALICIOUS

PDF

90.3 KB Created: 2021-09-06 07:35:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e1fb145097170827a8e417825df2aba5 SHA-1: c725954e6bea7ec8e8d38d2c9661eb4b176d45b3 SHA-256: c85c8c0da0546dc866cc93be664c326069b028bb1048e81cf84a694f596608f1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The heuristics indicate the document functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites. The 'SE_MFA_LURE' heuristic suggests the document's content is designed to trick users into providing one-time codes or MFA approvals, consistent with credential phishing or session token theft. No scripts were extracted, but the PDF structure itself facilitates the attack by hosting numerous links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://jvlegacyhomerepairsmd.com/nbloom/fckuploads/file/37148463235.pdf In PDF document text
    • https://imaggu.com/ci/userfiles/files/luvaregudawosa.pdfIn PDF document text
    • http://gdgom.com/upload/file/210815094919013417whue78fk6s0y.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/79055998360.pdfIn PDF document text
    • http://kondicionery-pushkino.ru/upload_picture/file/rinekutexomiguf.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/l7m1jnmusirq7jmpktj37qtg1q/61826822081.pdfIn PDF document text
    • https://skywaytravelandholidays.com/ckfinder/userfiles/files/zobatofamiponadefexiw.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffff10d319---90042308256.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/0a092e580c053332bcbce1a5e62b55e1/wezogigurepaxovi.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/be406077fc6889e59f665e99eeb2664e/karijap.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070cadbb3f8b---saxuzumezevokejidivexedes.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/27502289867.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/74775753293.pdfIn PDF document text
    • http://gmart-express.com/demo/uploadpic/file/tukubazegalodi.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/73537122962.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e0036aa94---jabite.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/91535713406.pdfIn PDF document text
    • http://yoron.net/up/files/24218948267.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/bugitime.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/81a7e93583b35d750c9f47374fc559fb/9658230436.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/psngld1qabmilj8vrkp04bkfj7/48780970315.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f04d03a561---resuvu.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/30189761138.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=keylogger+usb+manualPDF 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_off0000fc62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11479 10604 bytes
SHA-256: 9aef071dd0d743e328caaf6daad45465b59e437ddf5a0ab5b3cd3ef8af1171a6
font_02_sfnt_off00012cb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB7 18008 bytes
SHA-256: 00873dc8fd3739600e21a32d22e4673f78ecc99538486176985a5b450418ef40

Open this report in the interactive analyzer, or submit your own file for analysis.