Malicious PDF — malware analysis report

Static analysis result for SHA-256 482f57f1cd5c14d6…

MALICIOUS

PDF

93.6 KB Created: 2021-06-29 05:36:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 99afd559da4aad3a2b16ba117951b815 SHA-1: 099fe1f62a3d579cbc1e8920ee39cefc065c284c SHA-256: 482f57f1cd5c14d6222315cce9b67bb41b3d2971bf20205b7b711c603621697b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress sites. These sites host further PDF files, suggesting a multi-stage lure or distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff57fa3ea5---92622911003.pdf In PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/53519375010.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/65870618131.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c02cdfb0bcb---kotubomupela.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779b0351c20---46262202382.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/dazimezexiko.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/cb9ff54e41d911b198cd1dd0fcb874fb/54992187159.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c6eceb8ebfb---wuzegolagovabesogibolon.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/c7e27f3fb59473399118c519052ce8de/mibija.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/rifesurewavogisozolexef.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da3bdb0197e---firozabagawevi.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5c36564ff---74671485184.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c48339a7667---serogepaxebedefesa.pdfIn PDF document text
    • http://www.odnpoznan.pl/fotki/file/file/290321741.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/jusixuzomagafifa.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/gudejukodozadogafiluwefab.pdfIn PDF document text
    • http://mamnonlittlesun.com/upload/files/97864271202.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/najudidoxirumeti.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/80657476458.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160927806a990c---83326068362.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///21513677232.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8a864ea0d---97068870538.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/18238985647.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6e2869f68---99935145121.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608375aee4683---14809827653.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/18080641182.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=qualified+dividends+and+capital+gain+tax+worksheet+fillable+2020PDF 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_off000106ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011ebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBD 17400 bytes
SHA-256: 43562bcf977d340393f9c7679eb8e0898ed8e5e3318410f26f2b7bdc47f22959
font_02_sfnt_off00014c70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C70 11788 bytes
SHA-256: 3810bba5aed607ca93047ca70209e4ab0e43492f15467e0ea5913923df59c158