Malicious PDF — malware analysis report

Static analysis result for SHA-256 f539044d7c02d04f…

MALICIOUS

PDF

82.1 KB Created: 2021-09-08 00:20:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: dba0981e54d365a55404bff1920bbf23 SHA-1: f43a03c2d0e0f0078251845ab940497d4e0c2ecc SHA-256: f539044d7c02d04f292477ec000bf85e9e2c19ddb428bbcd5269f967017bf37e
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple distinct hosts, some of which are associated with compromised CMS uploads. The presence of numerous unknown URLs suggests a distribution or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081645e464cf---zuwaxedopavinoputuzu.pdf In PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/mewipivul.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/zunanawajorinopopemedolu.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/2e509e371dadce4394d51ebfc2cb5548/63358449499.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/motolawalugadereruki.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/jefalole.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/nozux.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/12474884484.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/37277101499.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/e4eaccae36f1da5d5fc72488fc68a22c/liliriruzazinojabago.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f47b17d99c---pafozilofikupa.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/97a51ec34f951c251b701bb8c520aff5/53704249501.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/851a2d61fd9abb25e0956e670788e9f3/taterirer.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/ac71724dc6a0d37ce0b87f3eff6d5d33/64274884466.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944589ecab2---62527540632.pdfIn PDF document text
    • https://castel.ro/userfiles/file/89978575769.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16073756de60be---40781744518.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/xarafubovunonisiduw.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/rarimelok.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/96426994071.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/topotatupe.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/56706340292.pdfIn PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/8901124404.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/nozakizojewematitiw.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/winilujomawapabolene.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=convert+pdf+file+to+word+document+onlinePDF 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_off0000dc67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC67 17616 bytes
SHA-256: 388e62d40e049868d3abe269a1f60bd62872556dfb7d6437431c297553751a62
font_01_sfnt_off000109ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CA 10736 bytes
SHA-256: 9aed1581a6dea4b901dd8051a8e6ccc6a1561820fd984df7b836b6b96a256877
font_02_sfnt_off00012280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12280 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.