Malicious PDF — malware analysis report

Static analysis result for SHA-256 32a2b7bdccdc219a…

MALICIOUS

PDF

79.3 KB Created: 2021-07-01 00:36:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dec8e542e2e17d7d42b5ae2ba561380d SHA-1: ecc0dce556bec68051a01f6cb192eacfeb6a717c SHA-256: 32a2b7bdccdc219ad879bed2b2b49476c0df9c58bbe90458aa5f15ebe1e28f1b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. Heuristics indicate the PDF acts as a link farm, pointing to numerous external URLs hosted on potentially compromised or disposable domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://fcv-bo.org/data/fcv-bo/userfiles/file/noturalilunilelazolugafa.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/492e1434eba3966fb0917cceea2747fe/fuxiw.pdf
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/pepebixe.pdf
    • http://ebsenglish.net/_UploadFile/Images/file/80024328857.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16078f35c79f0a---masarotu.pdf
    • https://communeouchamps.fr/userfiles/file/62701797539.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/1f1d8f0dd201cbcd3b41dd12dce44c26/19912136850.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160afde2e8e199---kexarenajepudebalo.pdf
    • https://nepalimodelagency.com/userfiles/file/vulopixod.pdf
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/tirktrpdar162710pui2kqojrr/zoxelusurujomiba.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/44306bd8416d7bb782c63cb1d83ed463/dujarajetol.pdf
    • http://jr-bang.com/uploadfiles/20210609024717.pdf
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/m29dp6i4k3jatcrt0so7f54s47/lavujijuruguruzajub.pdf
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/1gn96q9n1g03e5t24v0bih44m3/zebilebujakujotetepeseb.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/kvv2nsmqd7jk9e9ogaflnljlvp/64032277119.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160927f9800741---25912112419.pdf
    • http://www.annaleehuber.com/content_files/file/44059756745.pdf
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/5fcfd45fee819e4e8b59cfb22f546540/sopebakanagejolafiten.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072eaa17b942---rumixabuzogedasur.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1852052e9e---kalaxefa.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609edae7e152c---xinibisoxadab.pdf
    • https://foundryindia.org/userfiles/file/betegariduderenakilezaluf.pdf
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/34a04b1149c030a0736b00690c6e2aaf/rogopurasiwujux.pdf
    • http://w3-japan.com/js/upload/files/noxakubijelamuxuzexufufib.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=a+cup+size
    • 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_off0000d6bf.bin
b37957010d296b0b569cfd1012a8462ab4221a26c5f12fde19428db7c1678244
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BF 9880 bytes
font_01_sfnt_off0000ecae.bin
9c5fd684ebe9a16fd7e81c9adce7f56e2cbfb9d8b3efee65a826127f1aa0ba0d
pdf-font-stream PDF embedded font (sfnt) at offset 0xECAE 16720 bytes
font_02_sfnt_off00011842.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11842 16792 bytes