Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f25708d87d90220…

MALICIOUS

PDF

79.4 KB Created: 2021-08-21 10:51:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 45980bdfee20e8455645d98de2844ea7 SHA-1: e1e45daf098faac3359e0af3dc1975128b465cd3 SHA-256: 0f25708d87d902204ed8741cfd03bd4e27fd137d2a60ffc59ae7c745ee6919b3
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and other disposable hosting sites. These links likely serve to redirect users to phishing pages or download further malicious payloads, aligning with common tactics for malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://infrive.ru/uplcv?utm_term=tere+bin+nahi+jeena+mar+jana+dholna+lyrics+download
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/745bfad800b11d7baf43804f9b10359c/jutuxibemufazup.pdf
    • http://tetobox-budapest.hu/uploads/files/jomoxibodupeneko.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608728cf117de---28864817462.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1610272177296c---varefibisugojuxel.pdf
    • http://cn-noah.com/uploadfile/file/xetaxovazikanorujude.pdf
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/4c04de518543dfd8c8473bd2afb2993b/80631644577.pdf
    • http://knshzj.com/CKEdit/upload/files/dasatugarakubaf.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/dcd67a793b996aaa3086057faae66d12/16570387825.pdf
    • https://gmt-tw.com/app/webroot/userfiles/files/putofogikebirovipekezo.pdf
    • http://sys-svinding.dk/userfiles/file/25659428182.pdf
    • http://c2ctrading.org/cms_upload/files/samamenixidefudo.pdf
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/6dta5b2iiitbldbnqa1lp3r4rm/83939747658.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/0c88d37720775d0ed625589e22c24556/derepegizudep.pdf
    • https://foulardfotografando.it/file/lovexaxitajorixeximozu.pdf
    • https://gomaihoa.net/upload/files/vonimerovepulabozusanidur.pdf
    • https://uzmanwebci.com/calisma2/files/uploads/13820100481.pdf
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/zumomubu.pdf
    • http://globalroomplus.com/bot/ckfinder/uf/files/17053454650.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160cd5c473cbb4---dakesitadojo.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808c3060e8d---66485226086.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/4kh8f6trbmv2v5e6es643vsg81/77123689965.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/a5a24148bb2cc0e88a0a8d7f9ad58039/nibidegezolaxevorumewetor.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/eb018315fbfdddb7426dcc80fb6ddee4/17119689884.pdf
    • https://nestsearch.in/admin/uploads/file/telufox.pdf
    • http://softwarefactory.nl/images/file/77538574365.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738af715dc4---79885999448.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d096.bin
ef5a7d04761522a267270c86850e9f8d886baf2560fc96fa025b7a87e759e25f
pdf-font-stream PDF embedded font (sfnt) at offset 0xD096 10968 bytes
font_01_sfnt_off0000e9d0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D0 16792 bytes
font_02_sfnt_off000101e2.bin
93d55cd2572ed2f495cf1c5d3ccfb45f5637f2b18541a32668901850e6c34642
pdf-font-stream PDF embedded font (sfnt) at offset 0x101E2 16940 bytes