Malicious PDF — malware analysis report

Static analysis result for SHA-256 da7212247f849a06…

MALICIOUS

PDF

81.0 KB Created: 2021-08-01 04:30:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f0b49052e929ab5f1d30a3075909d5e8 SHA-1: 8587b4ce18646650ef891bca1d40305f3364adf5 SHA-256: da7212247f849a06a85a11628f0498c34d057274c7246ece34bf2310e90358c3
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised WordPress uploads, suggesting it functions as a link farm. The primary goal appears to be directing users to potentially malicious or phishing content hosted on various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://cructi.ru/uplcv?utm_term=the+legend+of+zelda+ocarina+of+time+master+quest+n64+rom PDF link annotation
    • http://asremajazi.com/uploads/files/borov.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609620c5da3bb---movenisifokumas.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/jizaba.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/ik4mt0gasdk9hnofohb49diiiu/41672735463.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b46de0d0d0---87842402070.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8aac55bff487a8a67e0d3c40fbea6630/rozikowomuw.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/31544339756.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/f79fd62d32f86b099b5f1805ceaed6b2/48812904732.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160983a0a9964b---fikudenefipul.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1jarjkic56m5cj88fbmlomgal0/ponalodudiwuzevesinilukok.pdfIn PDF document text
    • http://heureka-cz.eu/files/febovaputotedekogi.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096c08e06d07---sekepilewopiko.pdfIn PDF document text
    • https://mimpiindah1.com/contents//files/36116258223.pdfIn PDF document text
    • https://dptech.vn/uploads/files/22989656889.pdfIn PDF document text
    • https://susta.vn/userfiles/file/zopajokaditanedasa.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1c4797bb2---mufuvewotubisubixo.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b303a34c7b0---39388892325.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/23443708943.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2243f537fc---95797324471.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/16889000725.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/v065edo74ge9q7lks2188lpafu/24715560794.pdfIn PDF document text
    • https://zakarpattya-tour.com/upload/nomitepamabikubep.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/dedogefotorexonutifomog.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210731000124.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/virekikorikudu.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_off0000d818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD818 16460 bytes
SHA-256: 7533e67cd2068945ac7e24248c6f90db6d7beb9185a793d6a7c8cd75f81cd14c
font_01_sfnt_off000102d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011aec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AEC 11436 bytes
SHA-256: 27f17e697b66944f732143931f83a7c7b48314fe084f164ab620d18642877690