Malicious PDF — malware analysis report

Static analysis result for SHA-256 dff9b1846728ee67…

MALICIOUS

PDF

71.2 KB Created: 2021-09-08 12:58:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 89282670a3e8d897985a108624d56cd3 SHA-1: 1dca0c70952f957485a46dd7d7dabb691148a5fb SHA-256: dff9b1846728ee6710199c5596d8067eb8b5785e1b0ae1cb8868cc5d538c0022
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains a link farm pointing to multiple unknown PDF files hosted on various domains, some of which appear to be compromised CMS uploads. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics suggests a tactic to distribute malicious content via SEO poisoning and compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://doktor-ara.com/userfiles/files/kujuzofag.pdf In PDF document text
    • http://leaguengn.com/userfiles/file///90442764109.pdfIn PDF document text
    • http://tctrack.vn/images/newtech/files/fefivid.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/newaj.pdfIn PDF document text
    • http://rayhovietnam.vn/upload/files/nixewesalegiwasuvemafeviz.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/xedojofabenikob.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/91b0dc87844839bf0138962ac3186451/18007852436.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/70641324455.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/12723460543.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/32080912057.pdfIn PDF document text
    • https://bi-kiesabbau.de/cmsimple/images/file/73224758445.pdfIn PDF document text
    • http://mrukseo.pl/userfiles/file/juvipegina.pdfIn PDF document text
    • https://amgaa.org/temp/files/55014649865.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161338bce3fe45---lonatujidukijagopagi.pdfIn PDF document text
    • http://skisun.it/userfiles/files/dopomi.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16136f27612c35---31912160259.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/marodofo.pdfIn PDF document text
    • http://moneymaker-gold.de/files/98940964877.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16137515ab8a6d---9892037590.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/jizotazurivi.pdfIn PDF document text
    • https://aneri12.cz/res/file/sevawiduxivuvafafufe.pdfIn PDF document text
    • https://bedandbreakfastholten.nl/userfiles/file/fixujamumobiwi.pdfIn PDF document text
    • https://agriturismoilcolle.org/userfiles/file/pibubezazexalopeladufu.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131aaa742933---44083058527.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=hiperplasia+prostatica+benigna+tratamiento+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_off0000b802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB802 15056 bytes
SHA-256: 3209a0647d6668181173d72f9f059f6f8c42b229b1b8b681c9a59d082209fa23
font_01_sfnt_off0000ddd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD0 11092 bytes
SHA-256: 0866b7564cf847827c9b6cfa3496b492f44b2d2b50be7f0a74f1791ab30ffdbe
font_02_sfnt_off0000f72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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