Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e4b96e272769c65…

MALICIOUS

PDF

71.8 KB Created: 2021-09-04 14:46:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ebd1a6f042301a6e5eae8b53e6037437 SHA-1: bc9b9ff1156c2dc3429208f32339c626f272ab8b SHA-256: 9e4b96e272769c65f980e7e47cae70b59db5ea07ac62feba74368b51aeea1cee
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised websites and link farms, suggesting a phishing or malware distribution scheme. The document body is unreadable, but the heuristics indicate a link farm strategy, likely to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/283c941594fc7f2b7f3bcabef498c638/55934134899.pdf In PDF document text
    • https://wfbulgaria.com/uploads/wysiwyg/files/piludizifajegiwanivozozo.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/16774109655.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/76203662799.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e93f012e0---nebupalapalowago.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/26b6eafa982f9e9480f4012b533fb184/norirasojuta.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/4984265875.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/93194994700.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f68fe14499---22053384941.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/81988350033.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/zavaliva.pdfIn PDF document text
    • http://al-farh-iq.com/upload/userfiles/file/22866553.pdfIn PDF document text
    • https://majubesar.info/contents//files/79421310900.pdfIn PDF document text
    • https://astek-telem.fr/userfiles/file/pasiminawilatakuva.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/nofurawolej.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f72036e7ba8---siresevaforedum.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba46570ec1---31596477566.pdfIn PDF document text
    • http://vanlysecurity.vn/vanly/album/files/13511359084.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/rufomikuj.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/46493303712.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/bekisimeteribagadodagaxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=professional+trading+strategies+pdfPDF 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_off0000b723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB723 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF35 16468 bytes
SHA-256: a3024ce4756b6d194f49e3ddc585094240bdb9c29f4e48abe806aa30f3884b84
font_02_sfnt_off0000f998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF998 10676 bytes
SHA-256: 2869aba381e9ec53f89ba196b7c94739ff8fb3b840b0e7c6e428ccf8f89f8fc1