Malicious PDF — malware analysis report

Static analysis result for SHA-256 d39f67f493b38af3…

MALICIOUS

PDF

82.2 KB Created: 2021-09-05 06:56:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7430ffdea12e4bdc46e299cc23b91702 SHA-1: f889075e7d0e315c53b92fb5afe9641fa5eeffcb SHA-256: d39f67f493b38af3d9ae4628445cde2b7fcb34d1671afde14df0851b42f92d1a
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to domains that appear to be compromised or used for hosting files. The ML classifier strongly indicated maliciousness, and the presence of link farm heuristics suggests an intent to redirect users to potentially harmful sites. No scripts were extracted, but the document structure and URL distribution are indicative of a phishing or content-luring scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://philabc.ru/uplcv?utm_term=como+juntar+dos+pdf+en+uno+gratis PDF link annotation
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/20154432770.pdfIn PDF document text
    • http://cobansut.com/userfiles/file/712159363.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/napawelubatexujojil.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/xetoligegujefamenunu.pdfIn PDF document text
    • http://jogforbigt.com/clients/6/61/61f7a61d17da296148a50ccd59c4a139/File/3724838401.pdfIn PDF document text
    • http://snabsz.ru/ckfinder/userfiles/files/rigezabinoposez.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/ugfg7tv62l1b90t1qeqvfgul3l/31468008981.pdfIn PDF document text
    • http://insureacompany.com/userfiles/file/kodifin.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/35140001525.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/mizasekumawinobisop.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/89745486502.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/802368383.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/3feef6ecaecdf18a10b7b2303b4f3fb8/kividokidapasofalumeb.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/88344663406.pdfIn PDF document text
    • https://vleek.com/uploads/files/kavogafipawasizalif.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c090af14b---fowivewu.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607578b5b2c8f---68393399409.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607e665193bba---71705686340.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/jepakazaripo.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/zedan.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cdbe295393b---88367256190.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/widukofimod.pdfIn PDF document text
    • 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_off0000dd35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f54c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54C 11056 bytes
SHA-256: f10c320b21519e2029fdb60adbd5098114f78c58cef070833a6ac613c93226a8
font_02_sfnt_off00010ed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED1 17340 bytes
SHA-256: 366ad9a05d3c06fda8a0003961f0ab165e7ca62f539db9364972800470045908