Malicious PDF — malware analysis report

Static analysis result for SHA-256 245f8a9a62ca00be…

MALICIOUS

PDF

83.2 KB Created: 2021-07-05 05:30:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d054823574d599c92ffe330c318dfb97 SHA-1: e914a0a9752b7d28fbc9ac7137d47c8a70a7ffb9 SHA-256: 245f8a9a62ca00be426b721322cb5b4314abfb7fbc20f0dc72e9794f2eb166fc
96 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous URLs, many hosted on compromised CMS platforms or disposable domains. The ML classifier strongly indicated maliciousness, and the structure suggests an attempt to lure users to external sites, likely for further exploitation or phishing. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 5

  • 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://autoset66.ru/admin/ckfinder/userfiles/files/sokuluresaxazono.pdf
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f4bd1196d---jelakusiretiwezapotir.pdf
    • https://bnbtravels.com/ckfinder/userfiles/files/16040610281.pdf
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/tisizokigagoveb.pdf
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/e2439c3bfc5c4899d848b78929c957f9/87151238325.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/b8cc0484b249eebd36d60851b8632c71/71316785990.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc4e0d1b74---jokuto.pdf
    • http://www.contectrade.hu/fckfiles/file/86383115957.pdf
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/2991bc6dde28d3bc2d5c048535aae1cb/ragazom.pdf
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/km1u1akiqplajfsmb93gfacccb/ramezejagujimov.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2njragfjcl2516rcbuqq529un3/rolebomojupile.pdf
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/21e903d8adf6fba959c43ac71b27f4e1/8099528559.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/0391df0e5d29bd90631fa029ed069d25/nekubenaxaguzege.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ee74c6395---pogitasojojefarerikisuz.pdf
    • http://asesorgubernamental.com/images/file/46238176027.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/e77fc9e13bd01523201792e689019680/21690808307.pdf
    • http://bizbecho.com/pa/trainstation/uploads/image/file/6701498493.pdf
    • http://digemnd.com/UserFiles/file/62081376116.pdf
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/b8bj1g13e7ka4sgm15ot1iecds/lurufosugivuguferiruputu.pdf
    • http://luatsutiengtrung.com/app/webroot/uploads/files/32649838261.pdf
    • https://stiff.pl/ckfinder/userfiles/files/wugudetodonazolisisapived.pdf
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/c1b60d86287ff7e0d812bfa5c96b6952/8731753049.pdf
    • https://amursvoidom.ru/media/files/67982195338.pdf
    • https://mimpishio2bet.net/contents//files/59112389633.pdf
    • http://www.aqsclimited.com/EditorImages/file/47869612492.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5492da45fc---63524830247.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=combine+relative+clauses+exercises
    • 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_off0000e30e.bin
98174c56887eccd0390c4255556fc9224e76e471db813bcbc8a5448e4d582b00
pdf-font-stream PDF embedded font (sfnt) at offset 0xE30E 10832 bytes
font_01_sfnt_off0000fc17.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC17 16792 bytes
font_02_sfnt_off00011429.bin
63f6e772d94f362358bd48460d4f56fc98a71119c0d081da0dc0edc257bf437b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11429 16600 bytes