Malicious PDF — malware analysis report

Static analysis result for SHA-256 853efb45cf953c98…

MALICIOUS

PDF

100.6 KB Created: 2021-07-08 12:47:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9b51babfe190c2f4872b9e9fb8564838 SHA-1: a0732d9b96f7d3d9d1021f284e432b5108313f06 SHA-256: 853efb45cf953c98ccf5e74191d9a9ce829f5d509daef2d529876f96acec17c9
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lure victims to malicious websites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9787

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.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a53416d4c98---10161599530.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/dd2975c726f4284e6ed559ab07389384/dafutaparuzuzefobat.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160716fa16c56d---88729226665.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/mb7cakonq64tf3076kvk8l4ij3/gagelawufawipuwebitemim.pdf
    • http://ms-beauty.com/ckfinder/userfiles/files/xumadatamuvurubejumotisan.pdf
    • http://supermarketdv.ru/files/file/renunekevof.pdf
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b0f60e155---15295585730.pdf
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/64646310551d9c97ce204fb60b83cd35/16146744559.pdf
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/cacj5bp2mu6h4b0eqo50m0b9v9/51545879413.pdf
    • http://xn--e42bt3l.net/upfile/files/74083408253.pdf
    • http://pizzeriadevita.it/userfiles/files/76386674855.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607732bd768c8---31724752245.pdf
    • https://evergreencans.com/userfiles/file/tofexonegenenusub.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baf1c911838---luvumixuxifi.pdf
    • https://gw21.ch/uploads/userfiles/file/pukiv.pdf
    • http://nakamurasangyou.jp/app/webroot/uploads/files/pofojukenemamaxijemot.pdf
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa17a00dc8---2923810441.pdf
    • https://okinawa4d.com/contents//files/90999038129.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909d7906782---94129585460.pdf
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/2bc827677cf3e0fde540a6fc7afd1888/relakodeloxawojogu.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/7gtj8h5frp3oci6nrpfb67cvpc/33016518782.pdf
    • http://phuocthuan.vn/images/pic/file/83587026679.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/83fm63lqe5ju1rnhttnadgjcn2/gowoxolijuvan.pdf
    • http://zhouzhuank.com/v15/Upload/file/20216201745267576.pdf
    • https://najlepsze-w-polsce.pl/uploads/23780812054.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b381a721188---4951109705.pdf
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/8453160953e99dc6b1fa9ec6946ac4b7/58486806186.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=bdd+in+action+second+edition+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_off0001226d.bin
13927bfee446652253173fd5f1e04aef3cf2a7b80aa01434ad252ad5460336bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1226D 10520 bytes
font_01_sfnt_off00013a86.bin
0e2b45fe21aab21afaf54a26005b73c32cbea11d64a37ffb60c4b2beed8174ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A86 19788 bytes
font_02_sfnt_off00016cce.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16CCE 16792 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.