Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d3074f94a58034e…

MALICIOUS

PDF

76.3 KB Created: 2021-09-07 14:13:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5f4846bc9d367822e5be62c284878dc8 SHA-1: 0cfcc39a5113717b592157b6d790d716c47a92e4 SHA-256: 9d3074f94a58034e7f085f95524b204a05d0b2ed157c8fce9dacbdde4db36291
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate an attempt to exploit users by directing them to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/b2ffdcba75642f0e22d2d69c529f0e8e/77501325223.pdf In PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/sotoxurimes.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16083317d91946---xaduzinoliwarip.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/ragelugurafoxizu.pdfIn PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210806_FCCCF93922F0A3A3.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/28521157389.pdfIn PDF document text
    • http://xn--80akoseq9f.xn--p1ai/userfiles/file/78287582881.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/muruzixedi.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/51058135996.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/xered.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/494e9c53c3e05face6654f7394da54b8/goluk.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/renojiko.pdfIn PDF document text
    • http://biotop-zamosc.pl/userfiles/file/26526113011.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/bcae8bb4a8a168b66dbf37d93fd8e45a/76366749696.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9af35aa89---96724738734.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/68752863705.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/15104547533.pdfIn PDF document text
    • http://navakarenterprises.com/userfiles/file/85210852584.pdfIn PDF document text
    • http://heibldr.hu/FCKfeltoltott/file/10500327103.pdfIn PDF document text
    • http://bptramptour.pl/files/file/jivebefa.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/pagezamanesezitonem.pdfIn PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/71539929081.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=antigen+antibody+interaction+kuby+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_off0000c57a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC57A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8C 17196 bytes
SHA-256: 08ff17e31d3b343d47c6bb5160ff16b8ae0f844c2bdfefe799cea33a496fdbf6
font_02_sfnt_off00010a69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A69 11008 bytes
SHA-256: bbdb52717f9f1088ba2f8b8c5cabc8254da3df4101bb9f51ae52ff5ee6e0e133

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