Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cd1b835b85b7f25…

MALICIOUS

PDF

89.7 KB Created: 2021-09-02 17:58:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 050007a63d4a20bbb9d48a67711fe6da SHA-1: ef5e7ac1271d4fb9bc6e034fb4f5864bbe0d43d6 SHA-256: 5cd1b835b85b7f25c49bbda91cde120c1b688efac2ca886d5a27e1e6c5ec5575
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable domains. These links are likely intended to lure users into downloading further malicious content or visiting phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irlanc.ru/uplcv?utm_term=zaburzenia+psychiczne+i+emocjonalne+pdf PDF link annotation
    • http://jfac.kr/ckfinder/userfiles/files/ginaviburib.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/70760057868.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/5a1b317e7feeaa7ecb763abffab8920e/92128017857.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36315579409.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160963f61932ee---mejotibimewanenava.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7729c61a91---zokudigutisexuteted.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d79408aa38b---75793026931.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/85241150650.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160afd47e984b7---kedamuje.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/moviwituf.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/2021429659387004.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/859a3518c977d78865d649ba91901dd5/80445377142.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/files/40451691342.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610600bbb4ccb---12653940192.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/xunetegitosute.pdfIn PDF document text
    • https://farmstead.tw/farmstead/upload/files/76994733180.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/209e278385bf4df3bfffd5883000934d/wasezugabexir.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16094c21d03215---31729278837.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5a1906429---jobudogo.pdfIn PDF document text
    • http://sanders-scottfamily.com/clients/26926/File/68041241811.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ff3b3c71b---82594709859.pdfIn PDF document text
    • http://techbis.pl/files/file/lotufofitegasikepux.pdfIn PDF document text
    • https://protrialse.eu/files/files/63095490868.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_off0000f8dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DD 11296 bytes
SHA-256: f1b3b5c13a5ecb9c1ac6c1a3b2606eee60c8d8a1a7f2c01c9f037390453240b2
font_01_sfnt_off000112f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F9 18140 bytes
SHA-256: f67e23a2190ad190fc26cdd083a545314d28fd058bdbe11d79f7803e32e1a7c1
font_02_sfnt_off00014103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14103 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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