Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b3bc357ce4190cb…

MALICIOUS

PDF

78.6 KB Created: 2021-09-20 00:10:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: afc993e1819945e1690c6f0c26a47947 SHA-1: a2f5cba936a092623a6897cf3d55b16d87477caa SHA-256: 6b3bc357ce4190cb4a31d6b6bf48b8383eba2da1a5d4c38f3eb67efba813790e
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous links pointing to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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=where+did+my+gallery+photos+go PDF link annotation
    • http://volkshilfe-vlbg.at/images/content/files/66613021442.pdfIn PDF document text
    • https://mccartha-cobb.com/userfiles/files/kujigewagiriz.pdfIn PDF document text
    • http://roseeskin.com/userfiles/file/20210920033224.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/bowatebidejajefekokedo.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/lamaxojuzofisoxeb.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161312f6e4d2e0---dakojitinexomomozewanopi.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/gugumeluxu.pdfIn PDF document text
    • http://vectorma.ru/uploads/assets/file/rinawerukozivawi.pdfIn PDF document text
    • https://www.luxboss.com/ckfinder/userfiles/files/texukudupepuvasudozux.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/67457173510.pdfIn PDF document text
    • https://nhahangbienhaitien.com/uploads/files/wunuwuzudotofakonomaj.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/fumuseku.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16146928cb5306---sigowuvipolagigejituxo.pdfIn PDF document text
    • https://luminex.pl/upload/file/25243233386.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/12714549746.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/hm1qf27mkgji4h5u8ldoc2lhqn/37686753047.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/jilexovusikikatejisat.pdfIn PDF document text
    • http://bushurov.ru/images/files/6244654262.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/95332796298.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/13589126937.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/82391638790.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/51837228517.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_off0000cee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F6 17528 bytes
SHA-256: ad75a06fb757907b1d0e06fcaecd96235b4d1ef46a920f856cf2a6a139548531
font_02_sfnt_off00011403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11403 10840 bytes
SHA-256: 9aeaec58f7fb69013418e11af47969ea310880c8af612d9bb800e1e8929c1ac6