Malicious PDF — malware analysis report

Static analysis result for SHA-256 671fe8e9f506c759…

MALICIOUS

PDF

89.6 KB Created: 2021-08-08 10:32:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1f9787ce662f53b8771ef67f3b625ff8 SHA-1: 5f5a4640c2a057c941c481e47116708f987495f9 SHA-256: 671fe8e9f506c759ca0680df6fd6926a45948d78d6abcf3409d1b51901deda89
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of external URIs and link farms points towards a tactic of directing users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://machnik.net/ckfinder/userfiles/files/8246039833.pdf In PDF document text
    • https://canevastoilestjean.com/upload/editor/file/97761398146.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/lsmn2sngib0tqhnonfvpomhm1f/31776144052.pdfIn PDF document text
    • https://onlinendttraining.com/files/zebojutebujotowa.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/45844871041.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/4845a0bb22f7062123bdfe0f4fe68424/tututumowojoroladofa.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/48051160084.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef79a1acc8---lofozofimebadonebufoxe.pdfIn PDF document text
    • http://www.knickmeier.net/images/pageimg/file/simugip.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1610f0e29879e0---44365295456.pdfIn PDF document text
    • http://yuha.be/_files/file/kavubip.pdfIn PDF document text
    • http://anadarkogomezfamily.com/clients/7/76/76920377ef4e0cfe2c6e77079a05cbd4/File/13984680007.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/mutire.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/8fd47d6749973d52bec8f0b56fc97cf9/54429465639.pdfIn PDF document text
    • http://cabini.it/userfiles/files/dijajusokejodep.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-4-29/20210429154338815974.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/xadovuvoba.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/xazetebevewapuwisifafov.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/66011386743.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d5f18c9ff---muloxodexipituzef.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/kisumimulagi.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/57357034540.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/82985926148.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=mortal+kombat+x+hack+apk+android+1PDF 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_off0000ec4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4D 10856 bytes
SHA-256: 82e77e257bb0797fa66a373abef7c64b7d2773ec839bcb43d423bd160c2bf29b
font_01_sfnt_off000104fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FC 30616 bytes
SHA-256: 1b871ae05ad1ad5124cb2521af6673337375048a504c2e6a628f682b0f9e1ede
font_02_sfnt_off000140cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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