Malicious PDF — malware analysis report

Static analysis result for SHA-256 653dfaabf92c17d9…

MALICIOUS

PDF

83.4 KB Created: 2021-08-17 09:21:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: ef27218df56870826af63559ceb44ae5 SHA-1: 7837c185066631ad81d746a6c83a7effb361d753 SHA-256: 653dfaabf92c17d9a9313dd54857cadb4582065e86f9cbc2aba156c6db85e039
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Numerous embedded URLs, including those hosted on compromised WordPress sites and disposable domains, suggest a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with attempts to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://smidgel.ru/uplcv?utm_term=biomagnetismo+pares+por+enfermedad+pdf PDF link annotation
    • https://jotelek.hu/files/file/65188432938.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/pomiwelolerosekovugobefad.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/9604921355.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0ecbfd643f---23846857452.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/68818305659.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/f2cd5890285fcfa1425e8ebf5c584b2f/zilijiv.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/vogazes.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/gejudenipeviwewatakobeti.pdfIn PDF document text
    • https://sreekanakananda.com/ckfinder/userfiles/files/30332488894.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/cguilf10ot4of7vrqkqvpbllnr/98262870806.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/vutazad.pdfIn PDF document text
    • http://hopkins1983.com/clients/861771/File/rifarisetaretavis.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/58561306453.pdfIn PDF document text
    • http://goldway.jp/upload/board/file/37593933961.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160acfeca82349---88534867731.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/divakokixeve.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/7761105028.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/wurijebiwojadeli.pdfIn PDF document text
    • https://btegypt.com/file/gosebagogekesupeso.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/49651094080.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/masesoniparuga.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/dadagivo.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/5a8c453b7902957c0734d40d21b4916a/fekubevabulaluvevikir.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/e8300855449c2c63c6bdcd125bafb9a8/7055139137.pdfIn PDF document text
    • http://www.examnotice.in/uploads/files/raxope.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_off0000e002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE002 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF814 17336 bytes
SHA-256: 6369151647d524a22f73ba858c36bc186138dcf78608c38d79eb7f4a39b317b9
font_02_sfnt_off00012421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12421 10848 bytes
SHA-256: 7031825af9214e8e18d63983955df18e8e7049f618386447e8c703335a714cd9