Malicious PDF — malware analysis report

Static analysis result for SHA-256 57d25024f15a2cdf…

MALICIOUS

PDF

90.4 KB Created: 2021-07-02 09:14:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2d2c53bbb4f54cdccc18e86c541ada82 SHA-1: d43c87a8b4023344f02558d6533eb20f63b32af4 SHA-256: 57d25024f15a2cdffb5b1030ab655d8870c999af533e71bd57758a7813cdee95
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates these links are likely used for SEO manipulation or to redirect users to malicious content. No scripts were extracted, but the presence of numerous external links implies an attempt to lure users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://nomylo.ru/uplcv?utm_term=female+body+drawing+guide
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca0ff35e93---rezozarilomatataku.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/5b30796b4c5451c3671977f0ea2c52b8/kajiwejuk.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/40370bbd4c6b32e2bc4684a3bd58235e/89595564374.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5f09b04704---66059523500.pdf
    • http://clinicaveterinariailmarzocco.it/userfiles/files/wusunilebetulevamazomile.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/0d6d50a009edf82fbb78b9e01a61936f/25765634276.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a18939ad297---35686632716.pdf
    • http://fvv-hohenfelde.de/sites/default/files/files/sumakawupadejumitagok.pdf
    • https://cuacuonbentre.com/upload/files/faxob.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b3500f39c---83237618298.pdf
    • https://lesfeesdelhetre.fr/upload/files/15519084210.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160980b3dc7190---93162059158.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083fed2974d2---luwaliwar.pdf
    • http://noithatnhapkhaugiasi.com/luutru/files/dobipijovazikog.pdf
    • http://orchid-daikanyama.com/userfiles/file/86662324884.pdf
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/1561bad526151082105481abbb4ac5f9/zomuzipepixi.pdf
    • https://augsburger-dartliga.de/uploads/file/bawivurori.pdf
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/b0b40c1c400f1e26fa2f865caab0b878/71978124063.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/ffa47e73d9ce3a04c1cd40b2ca1ba140/sakopinadufuvi.pdf
    • https://anmimar.com/royal/userfiles/file/24558875137.pdf
    • https://bititechnika.com/uploads/file/59671078258.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/dcb8d3125a004e2c4068cdcbc7173186/bovozukupaxidiguvu.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/qpbg9r0av99b3g2a4kndot40q1/19139355586.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_off000101bf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x101BF 16792 bytes
font_01_sfnt_off000119d6.bin
ad866304aba52c7b7d1e3a02f0fa687083019dcebfbaf98b7ee334751ff77d8a
pdf-font-stream PDF embedded font (sfnt) at offset 0x119D6 10740 bytes
font_02_sfnt_off00013241.bin
b37acad1857b8c892be82bc6c30766c9a99b7e3354aaa0c46e040595412dcd14
pdf-font-stream PDF embedded font (sfnt) at offset 0x13241 16348 bytes