Malicious PDF — malware analysis report

Static analysis result for SHA-256 78842c4729582db7…

MALICIOUS

PDF

103.2 KB Created: 2021-09-09 08:32:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 517f680823c614f575288047204fe924 SHA-1: e7e04b3e2d61abdbf401f9880d0a69bf7d6414f2 SHA-256: 78842c4729582db7e564e0744d9ba29ce12b55f2e5ed9a8d78cdec93d352085a
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to compromised WordPress sites, designed to trick users into downloading further malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The presence of numerous unknown URLs suggests a broad phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133424144847---pevozekanifu.pdf
    • https://btcauction.vn/hinhanh/file/67594427967.pdf
    • http://enjoybowlramenandpoke.com/uploads/files/45914203779.pdf
    • https://tdemo.order-pro.com/ckfinder/userfiles/files/37344990575.pdf
    • http://gemaeldeundobjekte.de/uploads/files/44699092490.pdf
    • http://yuli-china.ru/d/files/tukugutime.pdf
    • http://clinivetmadonnadirosa.eu/userfiles/files/92682195615.pdf
    • http://noithatmfc.com/media/ftp/file/vizazimaxajefefi.pdf
    • https://tiguan-wiki.ru/file/jipofobixixawiruwuge.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/a67da9a0bf84e0663ba85a5a4cacdff5/wovonijisudesuju.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff8f02a60a---vuviliwunu.pdf
    • https://e-fasteners.eu/media/file/17533137758.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139838b8326e---82319538618.pdf
    • https://preprodpcb.com/userfiles/files/51762147592.pdf
    • http://cambresisemploi.fr/ckfinder/userfiles/files/72554632594.pdf
    • https://dudikom.pl/userfiles/file/merapinagutiruwukoxuza.pdf
    • http://kaitosushisb.com/uploads/files/48903535384.pdf
    • http://studiosantese.eu/userfiles/files/9487703238.pdf
    • http://stlnsk.ru/uploads/file/favunuxedigefe.pdf
    • https://greenlakepaint.com/ckfinder/userfiles/files/18531004482.pdf
    • http://scandirent-new.ru/uploads/assets/file/kawetedupoloneminuri.pdf
    • http://jtylek.pl/Upload/file/35465328521.pdf
    • http://e-kva.ru/admin/ckfinder/userfiles/files/65873905041.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=vidathu+karuppu+novel+pdf+free+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001254e.bin
50df6242763be27b77a736169d36b9402c5c2df6cf7d1c3f5bffe017e7c08f8a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1254E 10740 bytes
font_01_sfnt_off00013df5.bin
cd79bbcfee45fa2d3f6f415981c730b80e62984024b9f99c5abda868e8cce675
pdf-font-stream PDF embedded font (sfnt) at offset 0x13DF5 22580 bytes
font_02_sfnt_off00017696.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x17696 16792 bytes