Malicious PDF — malware analysis report

Static analysis result for SHA-256 c195ec975e92503c…

MALICIOUS

PDF

75.1 KB Created: 2021-07-02 07:15:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5c7520c6b3db370588e58106d723158b SHA-1: 7891da842d1c70781a1da7302c801580d50c7093 SHA-256: c195ec975e92503cfb9c636ff4e7ba910aed6da97a96b0f1d77f7176b38aad8f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised CMS upload directories and disposable hosting, indicative of a link farm designed to obscure the final malicious destination. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are commonly associated with phishing or malware delivery campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://philabc.ru/uplcv?utm_term=testament+of+sister+new+devil+ep+2
    • http://www.tobywells.org/media/fckdir/file/revudukowojojesovu.pdf
    • http://aytekinpolatel.com/image/files/7190029254.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/pqvcqa93bc473k425nev4oh18f/63622189199.pdf
    • https://la-klamm.org/userfiles/file/ronavojekoderupelif.pdf
    • http://eksan-ltd.com/userfiles/file/36877072027.pdf
    • http://worldplastsolution.com/ckfinder/userfiles/files/44737759597.pdf
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/1vrvailg93k3lco41q39jb4him/namovugamukirosesuzesinak.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16084d1f41a391---wipikarukaze.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724a0b6609a---41429776427.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5e0b30069---81036336352.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609736346498c---64861869248.pdf
    • http://gintaras.cz/userfiles/file/66532266459.pdf
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/0bdd0d9fe9a990a2ad45c54113af4795/22238754676.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb1db22c40---romavugotofid.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/ut6uugn2q9tq4koup8sqgoc634/95296521243.pdf
    • http://barcabianca.eu/upload/file/pumovebuveti.pdf
    • https://miaousland.fr/ckfinder/userfiles/files/65345186634.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/cc0cf92a0fe48d5ff5f2246627067963/libavebemodejav.pdf
    • https://mszukam.pl/dat//file/10756800956.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/3416406f0aadfb04207f08f769f30b40/64683002352.pdf
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/3073b78f58cff262445ab22279547f28/salujarumotoba.pdf
    • 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_off0000c0b5.bin
cfec3ff417597dfc27cae22e18a9c44603cfb0dccc03fa115d00fd44a8bc7dd5
pdf-font-stream PDF embedded font (sfnt) at offset 0xC0B5 10892 bytes
font_01_sfnt_off0000d9ff.bin
4d83e5069a0d866ca68e5818a9245e3d7a37fabe7703aeba67a1411b33ec3a41
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FF 17488 bytes
font_02_sfnt_off00010718.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10718 16792 bytes