Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7bcf3fd5e8c9f5f…

MALICIOUS

PDF

102.3 KB Created: 2021-07-13 21:58:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2a9e9491eccb7b2fedf9edd27443b4b3 SHA-1: 8340b0c9051bab1b066330582d68e86af6d5565d SHA-256: d7bcf3fd5e8c9f5f57b2f931268c862b28d93a54d129a6b6c0562496726560ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple compromised WordPress sites, likely intended to lure users into clicking through to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. No scripts were extracted, but the structure and URL patterns are consistent with a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

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://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086c411c686d---75216216583.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5f4584d31---84872963801.pdf
    • https://arket.io/wp-content/plugins/super-forms/uploads/php/files/tpp6p6i40boott45s1ka9otab6/temarukivojoratu.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/b73b4cf2b9e28f77377855a4146c2576/49923683182.pdf
    • https://autoradiator.mn/uploads/ckfinder/files/21914618874.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/5a678d34d812eb5e9e34eea5a6663e76/62330661538.pdf
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/in4ucr38h5epas7j4c1us3stpk/23410286973.pdf
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160794581cb626---januderolowututiwuxif.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609bdd660f811---20057120625.pdf
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/4255363825e167a6ce251a6e5daa7b60/juwizijakate.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cf43e0582a5---27410876996.pdf
    • http://botosani.ro/img/uploads/file/bibopevokudunuruwebe.pdf
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a431404d91a---1773931592.pdf
    • http://cheers-gifts.com/userfiles/14919144089.pdf
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/qf821mv42lvj3s6lk8aupn07kc/46532327777.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16076b12ecd015---16677869027.pdf
    • http://szrealty.net/uploadpic/2021-5/file/2021051719550273499.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c48dbbeed5e---mefevemuvifenataladow.pdf
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/3f49821f736d03ae4a31c49a9b5c0c35/jeduravipasedopifokifape.pdf
    • http://progfin.pl/userfiles/file/34643359281.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/p2mvos1u1m734sg64npuli8dn8/75201563730.pdf
    • http://ucity69.com/clients/861769/File/sijimebuzajafasin.pdf
    • http://dyglas.com/userData/board/file/kelonap.pdf
    • http://botosani.ro/img/uploads/file/95131118599.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/ce708150110988fccfac548c7dd6c230/96774738539.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afac16d459e---penelamesubo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=nice+u+words+to+describe+someone
    • 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_off00012b97.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B97 16792 bytes
font_01_sfnt_off000143ae.bin
a8d1808cec59eb737ec18b0648c470022c30df5a195ea2585316060730ca9549
pdf-font-stream PDF embedded font (sfnt) at offset 0x143AE 10628 bytes
font_02_sfnt_off00015c10.bin
296eb6b42ec8abf7785acb21fcfe2b3423762654fdf26023d307540c4c269b73
pdf-font-stream PDF embedded font (sfnt) at offset 0x15C10 18352 bytes