Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5a99909dd29c612…

MALICIOUS

PDF

84.4 KB Created: 2021-09-15 10:56:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: df614b6669f18f9b85db5111d0a04dc3 SHA-1: c587c41f663a37d0f24706bd7ebfbc0758c17053 SHA-256: f5a99909dd29c612e02604bec06159ad7b6ccd88c67610654700920ff87c5800
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains a link farm pointing to numerous domains, many of which appear to be compromised or disposable hosting, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://garglob.ru/uplcv?utm_term=cars+3+driven+to+win+download+for+android PDF link annotation
    • http://china-zub.ru/userfiles/file/zonimidowigesopoka.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/f63ddc5df26a6f610808fc147fe16ce6/79406968186.pdfIn PDF document text
    • https://poganyvolgyi.hu/userfiles/file/84947769730.pdfIn PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/wivevu.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614087170ac43---31749898099.pdfIn PDF document text
    • https://sysyanginguvenlik.com/uploads/files/xubekimu.pdfIn PDF document text
    • https://mahae.hu/files/files/58108830989.pdfIn PDF document text
    • http://nilesk.com/userfiles/file/36013010571.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/sowetutekodukibiwim.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161417a50370cf---19190017184.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/10088613504.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/gemikalivabuwafaxalus.pdfIn PDF document text
    • http://www.gobarging.com/uploads/textareas/file/18639396235.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/lavezug.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16140842e60c7d---vamuxawesuvipepofaxe.pdfIn PDF document text
    • http://nb-magnet.com/upload/files/1841275389.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4d275dbce---21757967203.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/70540120219.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/pupufibaburiwapuvexisu.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137867d7cd85---sukefagezifumabiw.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/pukolom.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/161412985a6e64---fidinonagaditameker.pdfIn PDF document text
    • https://baglab.pl/galeria/file/92969989979.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_off0000dfb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB0 10700 bytes
SHA-256: 4a0439626ad681b2e10551b7807ef2cbff58fb31b899fa56705afc78072607dc
font_01_sfnt_off0000f87d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001108f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108F 19540 bytes
SHA-256: 1d6744f8bdfe869ecb34861291baf0739b59642002cd56710737c5704f08d7c3

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