Malicious PDF — malware analysis report

Static analysis result for SHA-256 43f4cb2784d8a372…

MALICIOUS

PDF

86.3 KB Created: 2021-07-13 20:48:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 03fd5103631525bf3b70f1a9bd67d984 SHA-1: 2e6cef175edee85bdb6d0d6bd4df63084520b6be SHA-256: 43f4cb2784d8a372555b64bef97dc76054d86e561423f279fce2e61a98aca50c
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 high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to external sites, some of which are hosted on compromised CMS platforms. The presence of 'utm_term' parameters in some URLs suggests a phishing or SEO manipulation tactic to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://an-professional.ru/img/files/file/dapoved.pdf In PDF document text
    • https://uniqrelation.com/userfiles/file/24370222707.pdfIn PDF document text
    • http://anupbolivia.com/images/files/4234350617.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/73268593419.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/gutiguketaliwejafebaba.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/18234789824.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/c6f1343b7f6611151b7e89d2dd40cd4d/3358889862.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070952c84b99---mizagodofejebosaditijo.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/55250937751.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/senav.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/dakibima.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/85867826487.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/737699c2d1a7e80bdea321b99732aaa6/96177346428.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/pijapanujojepalubiwodogim.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/nng7vk6akfa04plf24be5ggmm0/1176318312.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/fapowunukodezixavurafo.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a013b2be02c---67635486598.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/ee0ddd4c53a89b8e7af5983119373038/wopered.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/22bb7e7be8031198afcce8a499533c68/59635258853.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/q1h39kopb3dtgds7rnqj5hd88g/23848420602.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e842dde25db---vatodozudo.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/b349ef7f993edc94e09c3302cb8201f9/gugemoseluzavuvama.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3001cec8b---vumelofaragukife.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/17194628006.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=rare+dog+breeds+in+the+usPDF 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_off0000f143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF143 10768 bytes
SHA-256: 02fdabcf4c325f4498e4d78151d228faf71ce4d5235e9365c7f2fc2104360be2
font_01_sfnt_off000109c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D7 16276 bytes
SHA-256: 474930f8c479b20310d8c63ff2ccd626d83b4a8e1cb48f0e94163da4d6271ede

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