Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f3603c6528f1439…

MALICIOUS

PDF

85.4 KB Created: 2021-09-10 21:47:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 043075a15ead5607705e47ac4ea0e075 SHA-1: 10eecc357cee81def91953027195b9aa39a78760 SHA-256: 2f3603c6528f1439b21afd4a9ba9453e50c9203e89643cb94b5745fdd8c1bf74
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to disposable domains or compromised WordPress upload storage, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/uplcv?utm_term=home+sweet+hell+torrent PDF link annotation
    • http://hnsunnyfood.com/d/files/bajojesipusetetaladex.pdfIn PDF document text
    • http://holland-ex.com/images/blog/file/seker.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/86934696108.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/5283038704.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/pifesofuxoba.pdfIn PDF document text
    • https://eurotig.ro/file/14987294571.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/fawalama.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/61597893734.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/51770653296.pdfIn PDF document text
    • https://wisserarm.nl/app/webroot/files/userfiles/files/30729159343.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/54797153460.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161334ace448a2---51597995415.pdfIn PDF document text
    • http://tottazo.com/userfiles/file/30448143591.pdfIn PDF document text
    • http://bosch-elektronarzedzia.pl/catalog/file/9036873966.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/71892224248.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/remunasedexepoleg.pdfIn PDF document text
    • http://grupophi.es/uploads/files/31055671476.pdfIn PDF document text
    • https://booking-news.hkdnracing.com/webroot/editor-uploads/files/47512827658.pdfIn PDF document text
    • https://onlinendttraining.com/files/sederawatorisorixunesiwaf.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/22027612317.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613139a68290f---vutawonesef.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/sixavasujutoxa.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3ad5a431e---nusinebikotoxad.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00012de6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12DE6 16988 bytes
SHA-256: 0ad9e77c118e6949fc44fd3283a75f65648ba684534a0287d13fae09f503631d
font_00_sfnt_off0000c486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC486 24200 bytes
SHA-256: efc6fe1bc9eb804c787392c0fc998ccf706bc15fa5ff77a9e0676e8aa244479f
font_01_sfnt_off0000ff27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF27 10196 bytes
SHA-256: bb22600a6b2d18ada99fda255ec9aa8b9d6bceacafa0f144520b26f77d0ff2c7
font_02_sfnt_off000115d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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