Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e4382481719ad96…

MALICIOUS

PDF

69.8 KB Created: 2021-09-20 08:08:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ed02749b26be5307c0914499fdf27dae SHA-1: bd14c889815b7eb2cf70113ea9f2b26ced5ceded SHA-256: 7e4382481719ad968999406d3fb38fb69bbc57de33a388a6eed4d095109faac6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple domains, some of which are hosted on compromised WordPress sites, suggesting an attempt to obscure the final destination and evade detection. The PDF structure and embedded links are characteristic of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://tsrmvolontari.it/userfiles/files/jasazaxonekubizipek.pdf In PDF document text
    • http://ombs.ru/uploads/files/59112045598.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/35916951662.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/98603709515.pdfIn PDF document text
    • https://dm288.com/slicice/file/xuwubemiregidebekunisujat.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/751e476b6bfd35ded2fdd937bbf65c94/75189133354.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/37592731511.pdfIn PDF document text
    • http://compagniaviaggi.gattinonimondodivacanze.it/themes/userfiles/files/wadogom.pdfIn PDF document text
    • http://naturalwonders.com/uploads/files/xuwazenutarerog.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16132f3346e169---58717436081.pdfIn PDF document text
    • https://pindimana.in/uploads/file/9581322683.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/fogitovatik.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130503d402ab---zejebatakixidigesokikela.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/xirogozinugig.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/momapopuwuterikugema.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/5592588828.pdfIn PDF document text
    • http://kp-technik.cz/ckfinder/userfiles/files/64168499742.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/pagelasujenanoxexemawa.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/judozosasotubopojizolixu.pdfIn PDF document text
    • http://thietkewebsite.btccorp.vn/uploads/files/lilitezumela.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/dbc9fa5c855af285dabf173ed2094ec4/rudeweter.pdfIn PDF document text
    • http://eskuvotoszkanaban.hu/editor_up/wudugexevinodo.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/ligogipulexikemu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=cheat+turboprop+flight+simulatorPDF 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_off0000b236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB236 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA4D 10972 bytes
SHA-256: b93402250018e37b1d6b895a684033e122e6a92fba14a1052b3ae2c3eb3355fd
font_02_sfnt_off0000e392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE392 14936 bytes
SHA-256: 102fb4d57640357233264b030d6a32304d2097143fcf970f0b0c050b37ca0f4a

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