Malicious PDF — malware analysis report

Static analysis result for SHA-256 68167b93c7365e64…

MALICIOUS

PDF

87.2 KB Created: 2021-08-20 20:46:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3e8d5b541322e3245b1fde93afaa0029 SHA-1: 2cb2df80d28765b12e15040120fcbd0a5d7fa928 SHA-256: 68167b93c7365e64af816b5faf3a7bc886f9a49c5ebae8ba1e3ddff3114daf5c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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://vivaibonomo.it/userfiles/files/2683714582.pdf
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/cab2e96daf3b9849ea01f59968e881bc/gununufadoj.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8a427912a---xomaneza.pdf
    • https://wietsevoermans.nl/ckfinder/userfiles/files/35328937964.pdf
    • http://commandhousecreations.com/uploads/files/31349021285.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160845fb6c1d21---53182345641.pdf
    • http://maxidmum.com/images/upload/fck/file/mifewiwabagobi.pdf
    • http://kuresi-kaitori.com/upload/content_pic/files/tivowudarudiza.pdf
    • https://mfdesign.hu/files/file/vuxaforute.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b8186140e6b---lebugi.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b4234b555c0---zodezowavuzofebew.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/dn1g1658htftjnajf8r505m16f/98610998528.pdf
    • http://aiken7050.com/clients/5/51/510ae66c864a6d23552e02d1b5190e2c/File/67664985385.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/5f375dc27e6919ec0617310af3dbff05/sifaferipinutuvodofuraje.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/d4b48fdca985fe4f6b128383a26f3ed0/40266907529.pdf
    • http://diamond6ranch.com/userfiles/file/bonenofabomimimegilefiw.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/14koh5618s7hdi1rfvk0nfncbt/lalovugaxowupa.pdf
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/d3fd54f6390cfc6f61df6765c2a1ee08/sofefupomuv.pdf
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/e3e544ed3bb1611acb42c0a0c11991b4/wosogik.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b705fb92428---damapirajim.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/4df60e6d994253a8480d88e9f9b8a92f/noxoxijilomubilumaluv.pdf
    • http://paillasse.hu/userfiles/file/558285878.pdf
    • http://exoticland.bg/upload/files/files/39120838913.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7a1b90f107---85876797675.pdf
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/72acb2a8a1f55cfc0491f186b01b37c9/berakirifoxewutovede.pdf
    • https://tecnicadovolante.com/images/file/60193760633.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=auto+chess+mobile+pc+download
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e76ff3cf23c---97980267680.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e63f.bin
c93eeacb8f6d7cba57b79d358b2b7b1cb9a33dc796df5fc32ca569c368cc18b8
pdf-font-stream PDF embedded font (sfnt) at offset 0xE63F 10984 bytes
font_01_sfnt_off0000ff6e.bin
dd01a94c4977fbfbff40a53844440b7ac2c3d88c3137538a28311903214cbdcc
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6E 17756 bytes
font_02_sfnt_off00012df2.bin
6df00093d1a1fd8b8f95901b42ba2863538c90606311dd4adf1993a433792d13
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF2 1692 bytes
font_03_sfnt_off000135fa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x135FA 16792 bytes