Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd98df6983e7bf22…

MALICIOUS

PDF

98.0 KB Created: 2021-07-08 20:27:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: be8f06b015e919a3384937b9d9690397 SHA-1: 841429691995333b059a9856f4893f8cda9fe2f0 SHA-256: cd98df6983e7bf2205e6299651a4c4565acfcbfc5b7091b407a6568cc1232142
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://archism.ru/uplcv?utm_term=best+mage+gold+farm+classic PDF link annotation
    • http://accessiblevehicleservices.com/userfiles/file/notujopisuwurilav.pdfIn PDF document text
    • https://x-software.cz/data/file/falivivibanuda.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/e3n42djtkb2dkgfukii7l47d52/57768492604.pdfIn PDF document text
    • https://activepymes.com/pub/file/6224031486.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/16131090277.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609de633cde67---defivimu.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/b4bd5b7cfe0288b05d4ee21b86bc93e7/89395326818.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/3f1sg5ct89v213m739q045v79n/pabawigeganejeji.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/31206645476.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b04677750---73694799894.pdfIn PDF document text
    • http://womenscouncildallasarboretum.org/clients/85748/File/rijagofagadokuba.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/5i0chnlmcjkpbmpdutoucmsdjc/4590684113.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/33010022376.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9afdd1333---siwuna.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/xikimuxowi.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/7940a9d1c328b657954b2342aa5940dc/70174892934.pdfIn PDF document text
    • http://herve-coiffure.ci/files/63989361788.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608505578353b---39284166379.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/bikomenifojogonodofax.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607895b622f1a---vivudezobijijidozamepawa.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/jlr1ds6fegvqvu2s95lnt4obsr/56611818597.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_off00011c3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3E 17512 bytes
SHA-256: 1e5453e4b63823d110ee84d6f562acc529b790b7e6fab3d7959357f852465cd3
font_01_sfnt_off00014a40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16257 10768 bytes
SHA-256: 8703c13540b0e3a1ac47fdf9ab7076e2f259c45aa2399d6ac70b1b52313bff15

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