Malicious PDF — malware analysis report

Static analysis result for SHA-256 935f26f997edc9f0…

MALICIOUS

PDF

67.9 KB Created: 2021-10-02 16:02:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b32aa02cd175fa72f03e6226a4f9ac36 SHA-1: 287d9529cf8360126194c55059b463238b7a84c3 SHA-256: 935f26f997edc9f0877aa7d33e38ed8b6b48a2282c76e5b50cd6b1865058239f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The heuristics indicate the PDF functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised or disposable domains. The presence of 'utm_term' parameters in some URLs suggests a phishing or SEO manipulation attempt to track user engagement with potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://huntic.ru/uplcv?utm_term=the+real+annabelle+higgins PDF link annotation
    • https://hotelite.in/userfiles/file/36295463687.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/97380250065.pdfIn PDF document text
    • https://irantruck.ir/data/file/57407321274.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/gazudilosibizo.pdfIn PDF document text
    • http://mannaz.pl/userfiles1/file/totafivefoditigutevone.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/0kgpavjbok3fgr64anj3hjteu6/59467264444.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/14613450412.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16153abc017211---99340134611.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/24557883751.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/tujajawozesefeve.pdfIn PDF document text
    • http://coolscape.info/images/files/51368834623.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/pivoluz.pdfIn PDF document text
    • http://tdbm.vn/upload/files/91999418536.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1614318c5574b8---11961135050.pdfIn PDF document text
    • http://tano-cable.com/d/files/fusar.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/rudopizawawilarubom.pdfIn PDF document text
    • https://www.supremecaravans.com.au/application/third_party/ckfinder/userfiles/files/71455208098.pdfIn PDF document text
    • http://toitureetfacade.fr/data/Files/78425301785.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/burabibegoxipofemusewero.pdfIn PDF document text
    • http://kesifveotesi.com/files/wasivuwas.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/sedebiwokeb.pdfIn PDF document text
    • http://artgrafika.cz/userfiles/file/tikomanokov.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/29584307224.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/37575580623.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/gunokiduxukifofotobi.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_off0000ae87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE87 10272 bytes
SHA-256: cd2410b67b3dfe92537161ac4c80e4e49857bea005e5f05cf032f48d4642659a
font_01_sfnt_off0000c585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC585 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dd97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD97 14592 bytes
SHA-256: 0c97020393ec6782879bf961cc35e88bb717122c5143550a8c7b5255ed95a40a

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