Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f870f2db7266b49…

MALICIOUS

PDF

119.6 KB Created: 2021-09-01 17:22:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 18da34bcae1cfcb0d3d905c2907077c2 SHA-1: 0af43006094f44bc76022e8550ccf961100ee546 SHA-256: 5f870f2db7266b49c342d5ff4c90ef67676d3cd505b72fa03fbb2521d7b8c17d
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm pointing to compromised websites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs are likely used to redirect users to malicious content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://tonmathunglan.vn/upload/files/rubenagisidaninutomuripaf.pdf In PDF document text
    • http://01host.ru/userfiles/files/2774163386.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/savixowazilobubanilapakaf.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b2dab7ab34b---wewapagufifazeriwo.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/buxiko.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/95822932384.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/a4f0e2te3hvect8c4d9bc8p61h/63660734327.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e50f2ebad---20239509088.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/635ocqbsfcai69dtpm3jpqjs5n/nosir.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/nipufefibepudugabivob.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/bidibibafotuv.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/zagidovuvefikemizijipa.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/16f3aaa51a37d1229d9cb0de0fd3180f/94178682674.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/jijejexazudibo.pdfIn PDF document text
    • http://saaretravel.ee/images/file/77949257682.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/9bf530cd526a64af6c8502c6bca5b899/73567554576.pdfIn PDF document text
    • http://metall-press.ru/files/69161375748.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee6998da43---lofejorinogosonodomumixu.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/97106031238.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/2c746114837e1b98492b21f0c3830b62/41896852533.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/46486823230.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da90e18b4a---muwizalupujasominaruwavip.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/rasutisomijabukozasagaton.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=cholesteatoma+in+both+earsPDF 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_off00016f9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000187b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x187B5 10544 bytes
SHA-256: e04387667dcc1f2e7204422eb13e59c71bd34900a8f4b06aa53994025e6ac3b6
font_02_sfnt_off00019f90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19F90 17760 bytes
SHA-256: b8f4454ba06c7d8789e0104fbbaf47db8d013b0d318eadaa0810ce5ee52b5319

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