Malicious PDF — malware analysis report

Static analysis result for SHA-256 9482739f8eb56e77…

MALICIOUS

PDF

84.3 KB Created: 2021-07-16 03:11:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d0e7ada47d41d9bf74ec518897a42740 SHA-1: f0e9b746bbbf3cde09d6b27b13896ae1185503e8 SHA-256: 9482739f8eb56e775d7ba7d2665d594053605774d1bf135705f0178281e557df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites hosting PDF files. This behavior is characteristic of a link farm designed to manipulate search engine rankings or redirect users to malicious content. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/uqdbcqqg1ne23062vtt6ui5860/kiloluzis.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/s30np93j3bkkabmgq7e8vvt8d0/dagipabazazasamupobuxasif.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a76ea9057---51603921665.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c1929ae474f---bogiroxodirebube.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/mqtd3sa6je25vsi8tdua801rns/86501948272.pdf
    • https://mimpishio1bet.net/contents//files/36231241885.pdf
    • http://2sisaccount.com/userfiles/files/9734164822.pdf
    • http://koszyczarek.pl/userfiles/file/pumixuki.pdf
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160b36e0eb056a---67465875437.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/8d54c48dfb9446bcda6375ce922261a7/31305419172.pdf
    • http://sooclose.eu/upload/File/50435415598.pdf
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/cc8e127ff96259762690209a8e5e2465/20266083733.pdf
    • http://czechdidgeridoo.com/admin/upload/file/lijubusi.pdf
    • http://vdtonline.vn/static/uploads/editor/files/22825006183.pdf
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/377e74e308ac9cbb53c2b8e3e99cc32f/37689824372.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/tfkille3qka9o1ja4svo79j06c/65353457102.pdf
    • http://10glazsikeyrosa.ru/file/robipabudumitoge.pdf
    • http://cobansut.com/userfiles/file/xufijibevuropugag.pdf
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/3802284435.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/irlp7c2dals5vm5ncrb6p98oqb/niwogiwosonosilegizifog.pdf
    • https://agatanorek.com/files/file/63683553443.pdf
    • http://bluedevils59.com/clients/862365/File/18470873102.pdf
    • http://homeopathyhongkong.org/files/76827318788.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/j2hqbvqvfr3h24n6dia1ohmcap/18861172663.pdf
    • http://ankamet.com/userfiles/file/fumuwilarunatokodixel.pdf
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c13030b50---wurazeruz.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=animal+crossing+deep+sea+prices
    • 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_off0000e74d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE74D 16792 bytes
font_01_sfnt_off0000ff5f.bin
8cc464eccf633e5b49054f91439656ede7e92eb786a14bc65aac17d5578e9ce8
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5F 16756 bytes
font_02_sfnt_off00012b39.bin
8805cbf61436759e416b2a4a6c11dd7d4dbbb3d48fff427ede13fdf9756fff05
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B39 10740 bytes