Malicious PDF — malware analysis report

Static analysis result for SHA-256 91c2473d585a86ad…

MALICIOUS

PDF

80.1 KB Created: 2021-09-03 21:21:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b17a05232341b80a93aa244340f57d57 SHA-1: 60c8b065e5809cb25548c054fc1fb27528a2d660 SHA-256: 91c2473d585a86ad1b5c2d79cda983188d59c748260121c67bd27410b5c55b8c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://oreade-breche.fr/userfiles/file/33173012320.pdf In PDF document text
    • http://www.romanschatztruhe.de/img/files/xaviwasuzinop.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021070202375273499.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfa6e101c9f---29943598049.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/fcc7f8c15d32dea114b895869cec6b66/jasovobume.pdfIn PDF document text
    • http://gtshotel.it/images/file/46140338318.pdfIn PDF document text
    • https://senhewood.com/d/files/medixojipomilim.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/qb20pu8jg1ca1316vp39rdvo26/bamujorat.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/58995345837.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/76470645456.pdfIn PDF document text
    • http://bimbrlata.cz/UserFiles/File/juweveguporisekebuvu.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/85917178030.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/d196c2183f9de5d0abea69bb76506f4d/59369165144.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/jomubutezojeluguguxomo.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/gtr740vgs1bnujs68pl1mf5ego/zugovulaluzisoruz.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/63505690626.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160b3df447fe84---vovegimexaxaguno.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/sefmv6ol78numdvo2ul1kv2jq6/vomozezugozoti.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/20858904680.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/955f9ca2c3d239b292dfaa44b99ce063/23067233296.pdfIn PDF document text
    • http://ciskmv.com/css/file/kovuvevo.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/vilipuwinimejuma.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/5705827177.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=esic+udc+result+pdf+2019PDF 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_off0000d558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD558 17316 bytes
SHA-256: a28558a5b154de89ed55e7f64c2edc9ed1e2962ff66fcc38617a5958169ec8e6
font_01_sfnt_off000101f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F2 10772 bytes
SHA-256: 70341bd4c1725e1a45c26707640beb5b5c49a9acd8c38c61463ac7c1ef4ba579
font_02_sfnt_off00011aee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1