Malicious PDF — malware analysis report

Static analysis result for SHA-256 b796e801d5aae381…

MALICIOUS

PDF

85.5 KB Created: 2021-08-06 15:28:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 320bb6008374b3f99f915f3108d84b32 SHA-1: 18359983b97133cf4457ebedb1c2a3cc6952bd8b SHA-256: b796e801d5aae3817cf8074baa7ece6e07594ada503d1267cc09e6262f3a930e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, which in turn host other PDF files. These links are presented in a link farm pattern, suggesting an attempt to manipulate search engine results or distribute malicious content. The presence of ClamAV detection and ML classifier flagging strongly indicates malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7909a29095---bijuwafa.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/6d43266237e78ad92bcd5bd11c277a95/judopujezuneta.pdf
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/489d4c38645258c49a4dd24adfcb3b45/dovikawisose.pdf
    • https://asset-books.com/userfiles/file/naxibizurevefiz.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085608383304---xozojop.pdf
    • http://radissonhoteltraining.com/userfiles/file/43447548671.pdf
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/c09a87d311d8ca43ceead19485ceee14/76839357871.pdf
    • http://videofilm-tv.ru/content/File/75554552863.pdf
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/1knmirdmsv10suvn45137h4e26/73247818640.pdf
    • http://technoculture.cz/admin/upload/file/pofivome.pdf
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/4455606d8c1c777383e39345016abd2b/59945800985.pdf
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/gorir.pdf
    • https://sport-jicin.cz/dokumenty/gumaxa.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1033a342d---xuwoxezezituwogoviso.pdf
    • https://karinbentum.nl/uploads/file/95715256187.pdf
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/7ufa7vfnlb0ban3m4ufrjk1vvq/maluguzixofa.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdab62cca7b---vowusifagixukatafed.pdf
    • http://thucphamchucnangmy.vn/uploads/files/77511200854.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160750e558ca7e---dajipirigelujo.pdf
    • https://pergamine.com/ckfinder/userfiles/files/74937462501.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/55ac5f08bc9ae7b71f88130f122f56f9/jazutijuramevusozab.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7114259614---32192071591.pdf
    • https://livre-art.com/ckfinder/userfiles/files/56021133716.pdf
    • http://mispuntossaga.com/campannas/file/gekive.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=minecraft+apk+download+v1.14.4.2+free+softonic
    • 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_off0000e984.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE984 16792 bytes
font_01_sfnt_off0001019b.bin
d258dd255bc5e1c0367af4090a2a4ed25cb11837dc45c0993f29ce0bd0b95d9b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1019B 11164 bytes
font_02_sfnt_off00011c02.bin
8b34bdeb47165df813a38d740e9d25cb3b5c6ee70ab764469f1ec380f980c8ee
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C02 17060 bytes