Malicious PDF — malware analysis report

Static analysis result for SHA-256 592a56ef7901157d…

MALICIOUS

PDF

70.1 KB Created: 2021-09-06 00:37:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 29e6d11843282189da6f47cf5b670566 SHA-1: b5f5ce00e866483a45295745e2cc87165fb14a7f SHA-256: 592a56ef7901157df1f63c19863e8242618860a2e771fbe83f884c3c333877db
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. Heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely serving as a distribution point for further malicious content. The presence of multiple compromised CMS upload links suggests a deliberate attempt to leverage vulnerable web infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efe15e8c3c---68354492332.pdf In PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/82441387142.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/g43njrk0e79eq2r75ai0ckpu65/25979179385.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/4kckpp2fj2ct101arh8rkfj5gj/50344177210.pdfIn PDF document text
    • http://lunaleo.pl/userfiles/file/tekadikiwuvotedonalogadax.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/jareleduleximidowa.pdfIn PDF document text
    • https://subarini.ro/mm/file/90208415997.pdfIn PDF document text
    • http://dade666.com/userfiles/202107file/2021072708083170554.pdfIn PDF document text
    • http://chukguwang.com/files/fckeditor/file/gaduranofadadupekube.pdfIn PDF document text
    • https://5uempat.com/contents//files/16315547711.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/bojagede.pdfIn PDF document text
    • http://funperm.ru/content/file/javojexilajigubatavigi.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ceb4a0dc0---fanoxaripid.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/92864098889.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/db6f83d9d4d7b761fff0d4e727c091b1/kiwunixu.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/17071284693.pdfIn PDF document text
    • https://computerzone.pk/file/5540243533.pdfIn PDF document text
    • https://pisangmanis.com/contents//files/5910323114.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/kasinujaxisulud.pdfIn PDF document text
    • http://statewideroadservices.com/clients/879378/File/78015008610.pdfIn PDF document text
    • http://jngf.cn/files/file/farikodomilometisexu.pdfIn PDF document text
    • http://clingac.com/d/files/wotidupanikoniroxugif.pdfIn PDF document text
    • http://drukarnia-warszawa.pl/pliki/file/82516338099.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/drr4lacgf8qsjce9djsidj2fm4/69155992335.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=jlpt+n3+grammar+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_off0000b41e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB41E 15476 bytes
SHA-256: d326ea6a34b18c41db50a4f96396dfb73972eacca08e00eae58b50b8099d48ff
font_01_sfnt_off0000db47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB47 10492 bytes
SHA-256: 495085ffcb3fb1aa5a0f0f37e38d6e475bb1829d253a567285c932426d4aa588
font_02_sfnt_off0000f2ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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