Malicious PDF — malware analysis report

Static analysis result for SHA-256 57f328fb1e1b66f2…

MALICIOUS

PDF

94.7 KB Created: 2021-08-12 20:01:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 57e346bb8dcf53d765f02b930572eb64 SHA-1: 0760d9d6541da47263a3b9cf59c385bf761bc333 SHA-256: 57f328fb1e1b66f2da2ff22e890a707318f31b9aa76c94b2c73867796a76b907
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the overall structure indicate an attempt to lure users to external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://krisoc.ru/uplcv?utm_term=how+to+get+a+high+vertical+jump+for+volleyball PDF link annotation
    • https://lesfeesdelhetre.fr/upload/files/fiwuvunujinis.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/bumapobija.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/wimetataw.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/lumiponoj.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16075a8cf652f8---75510797905.pdfIn PDF document text
    • https://maplesservice.com/wp-content/plugins/super-forms/uploads/php/files/b610ea2aa7fc080e42c7a80af3de67ee/tisefopubewawuru.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1610d91d0d52e9---93336707500.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/33135514405.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/gisifafi.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/tekowuwoxezeva.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/pilikevejutifobudufixa.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607575428f3a6---kovadijizom.pdfIn PDF document text
    • http://kuhomania.ru/ckfinder/userfiles/files/68476963545.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/95335199809.pdfIn PDF document text
    • https://mfdesign.hu/files/file/52618448397.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16083dcc199a6b---83737861001.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160913fa3bb59a---73635960313.pdfIn PDF document text
    • http://aclamerica.com/customers/CMS-IMAGES/file/gefip.pdfIn PDF document text
    • http://iphysiology.ru/upload/papibo.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/glrv4q833silh26upn3ho3m7mq/38809692891.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ee4747846---kodiliwumed.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/nutaruwova.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/72581422822.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/a8snd1kpvoshthsf6m7ec26fbr/83290357829.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_off00010b11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B11 11284 bytes
SHA-256: 10fdb06f9988e226a0823e3764cf4a8181014e20df4681ce9e5a3824e914a4b2
font_01_sfnt_off0001255b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1255B 17908 bytes
SHA-256: 0b808ad5d5e4ff81b288461aebdf35a584604e3d679773a6aa9cdfab61a318f8
font_02_sfnt_off000153b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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