Malicious PDF — malware analysis report

Static analysis result for SHA-256 59040c2003ecbf9d…

MALICIOUS

PDF

80.6 KB Created: 2021-07-04 13:44:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5f1e5fde96879a2be36a8f28ef9b80fc SHA-1: bbcc8c5a427cbf1b380f4e9b6c2660938d2b24b0 SHA-256: 59040c2003ecbf9dd440796e862d0769f767f910af96d1eaddf02ab0d74b5e57
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution lure. It contains a link farm pointing to numerous compromised WordPress sites, which in turn host other PDF files. The primary heuristic indicates a PDF link to an algorithmically-generated URL, suggesting an attempt to obscure the final malicious destination. No scripts were extracted, but the overall structure points to a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 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://laborke.ru/uplcv?utm_term=mustang+fastback+1960
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/cf33766742ed8f32c2a55a2c5b3428a9/18606941071.pdf
    • https://sapporopools.com/contents//files/faruto.pdf
    • http://royalgoodviewresort.com/Uploads/file/13104791630.pdf
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/77d925ab45048f9da1ba521b8b035b3e/98544641910.pdf
    • http://gillsandgeckos.com/userfiles/file/16174434361.pdf
    • http://buergerforum-tirol.at/file/sesakexod.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b30c878152e---guwukevonisapukev.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/20f761b405b39352bb70e7ee2a5805b4/17313931364.pdf
    • http://tamker.hu/userfiles/file/xuzepaxoguzabi.pdf
    • https://kurishupally.org/userfiles/file/zelabufotav.pdf
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7cde2214d---fidotatizoxujuzulilesedo.pdf
    • https://senhewood.com/d/files/lukoxuzebagenasa.pdf
    • http://tlxzkj.com/uploads/file/210528053288.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608e13c6145c1---fivupepiwopaxajaku.pdf
    • http://jrpst.pl/userfiles/file/2642226712.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2455247ec2---66695959772.pdf
    • http://sierrahighalumni.com/clients/878712/File/5389208048.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c13f41d66---tuvulebiradobugakumodetu.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16073650753e6f---20857521117.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/dcq04s4ahmmniulk0ln8iq5rf5/savasutosogonuxibige.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b03e869e610---81954885442.pdf
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/ce86fefc91961f0ad26027bf680044bd/gupevol.pdf
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/a7279bccfda5f88694916ccacf118a26/dudoxokokenuxetu.pdf
    • https://zionapostolicministries.org/uploads/file/geveju.pdf
    • http://ateliergermain.net/sites/default/files/file/rirelimemagalitijijeni.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b778b2bbfa---35449530053.pdf
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a8781ea11---kowajusarolojapofo.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_off0000d701.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD701 16792 bytes
font_01_sfnt_off0000ef13.bin
dda61dfd07b311c9e145645f0a5f7bbc861ec7d3d798226162c337107d489781		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF13 17140 bytes
font_02_sfnt_off00011bfa.bin
694ddc817496177ad0345b342363010454f63c6dc838b152a0ca94f663f9bfbf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BFA 10856 bytes

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