Malicious PDF — malware analysis report

Static analysis result for SHA-256 39e538f299d329e7…

MALICIOUS

PDF

85.2 KB Created: 2021-06-27 23:25:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 6c13cb6e3fbf07aa4584d1d9aedd180f SHA-1: 0c449cd4e00fba18b38e61329abee8cede24b09b SHA-256: 39e538f299d329e76e4adb4918af23e11eca5b5a4ad8cb8908b0a51ef4dceee1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is identified as malicious by ML classifiers and ClamAV, indicating it is a phishing or trojan PDF. It functions as a link farm, presenting numerous URLs that point to potentially compromised websites or disposable hosting. The presence of multiple external URIs and link farm heuristics strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://oniceh.ru/uplcv?utm_term=hunger+games+gomovies PDF link annotation
    • http://markasib.ru/ckfinder/userfiles/files/xotegusebetugisafaxigaxu.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/77053139506.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/224badac21e6fb95f76291556444aeb5/makuwekuvuketuxenezikijot.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/1ef10c045eaf3756106ace2ef3accfb7/zodudegawebigisinuwezev.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ab9d23e6e---zazuvut.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/52aleorvj6td0mmarpa1606243/93423990923.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios//files/85649061691.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f635bbf136---fitusagin.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/50723534763.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c57f4d08d---nelimaje.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/f0420469880c799bcb23904d92bf4eab/guxofiki.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/pizakudewufemi.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/63977635829.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb89d4959bc---puwivuxewikotorisidaf.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/ghq76brs49254g3n6fkclo6ug3/kolozubowezanejawisug.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160b3156eb19da---41897933928.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/31300851566.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c8dc3097d---17020978107.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608695095c3a7---pasowi.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a419fb82437---24420919402.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/kojenikudupipaxidufilapip.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/p148omo1tg29jnhj73cl1alvm0/6202843479.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_off0000eadc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADC 17312 bytes
SHA-256: 0d304e05e03ac53ea7e9a712eae5747421870fc9f59333539c66468bae6370fb
font_01_sfnt_off0001180a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1180A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13021 10464 bytes
SHA-256: 41fab784a940eb7013d4a829b1c1e37e60ccb9d79533bd409c74e8c6648784f4

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