Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9092ec36d45bcab…

MALICIOUS

PDF

155.5 KB Created: 2021-07-21 08:25:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 70739e8028ab36596c9dda1268ddd8b1 SHA-1: 55e2fbfd324f85b725a133ac90d93d4b2fff1988 SHA-256: c9092ec36d45bcabe3ca750477abfa37a0677815b7b88569684474801e14e6e4
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9756

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://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/b45vgkl55fdufv81o45gqubh8l/94479984608.pdf In PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/bf5bb543fc968d297b75aeb0a96e851b/6292017012.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/h2v9qkf8steu785p2dbjs6pfd7/65015764978.pdfIn PDF document text
    • https://isosklo.cz./uploads/87185949275.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/relosodomiwovozelotofid.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/51287264673.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e13d0bf1741---kizotolofe.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/5138963834.pdfIn PDF document text
    • http://cichanski.com/Upload/file/72884638748.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/40796538679.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/2ff447c4a19726d3a1df109223e9c6ed/12369195270.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/xagido.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa71dc47a5---posijowevinazikasuzoko.pdfIn PDF document text
    • http://op-gold.com/ck_image//files/18025497397.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/369d7ccef28a419a691f9c5231cac6fd/zozekorav.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/97576728599.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d4835e5ce---14419389166.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e76bdd3f953---66664443781.pdfIn PDF document text
    • https://tl-systems.hu/files/files/mixiwakaziwevimuvogepusam.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a5ec287a8---12102808763.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/65787399106.pdfIn PDF document text
    • http://mentaplywood.com/images_upload/files/mosifulikekawi.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/df736e2c94a35024e6afa997ad4e31c4/4067005572.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1608584144c234---50049382148.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/84273693228.pdfIn PDF document text
    • https://gulyaskantin.hu/uploads/frontend/files/kotoxazamizezidizamob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=resale+bookstores+near+mePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00020293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20293 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00021aa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21AA5 17512 bytes
SHA-256: dccd41f00a9d6d24a33676a01754a805244a11f34a71592459bf06d722eeb56d
font_02_sfnt_off00024895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24895 10456 bytes
SHA-256: cd682063b98f208980190aa2227c7969ef436be528b8c6d63b9b586388f17aa4