Malicious PDF — malware analysis report

Static analysis result for SHA-256 83f2e90cc8311ba2…

MALICIOUS

PDF

83.1 KB Created: 2021-09-23 10:31:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b64f92376c661d7e5402f4183d2b1f3f SHA-1: 26043df6b7ea6a8b64625fb7c60f921e53caeb60 SHA-256: 83f2e90cc8311ba24f013396010ee45292866d4fda96797bbd345796fea83452
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Static analysis revealed it functions as a link farm, with numerous embedded URLs pointing to various domains, including compromised WordPress uploads and disposable hosting. This pattern suggests an attempt to lure users to malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://huntic.ru/uplcv?utm_term=android+switch+keyboard+marshmallow PDF link annotation
    • http://litho-and-co.fr/ckeditor/upload/files/pokugudelesinugizute.pdfIn PDF document text
    • http://linkipt.com/_UploadEditor/files/14283593078.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/roloz.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/55981415672.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/rexew.pdfIn PDF document text
    • http://eikenhorstgroep.nl/userfiles/file/69756639525.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/78932059221.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/17994367110.pdfIn PDF document text
    • http://auroraenergyproject.it/userfiles/files/57566000260.pdfIn PDF document text
    • http://infosierra.es/images/editor/24864258057.pdfIn PDF document text
    • https://luckyfood.itweald.com/uploads/files/61419db21ef24.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612edadeeb777---21324320506.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/pivutejozadex.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/94836381530.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/masopaseneko.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bc0f988f93---88240159818.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/78331793073.pdfIn PDF document text
    • http://gapp.fr/medias/files/23543395407.pdfIn PDF document text
    • https://conviviodihera.it/dati/upload/file/jitovan.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/97498662621.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/38913822626.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614b5718343b3---vixipomadeg.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/tudasodulevijilibolipoz.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0918/40605b422a839fbc714d6586d9b024cf.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/96016084095.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_off0000e09b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AD 17084 bytes
SHA-256: 96d4aabfd971b2d2b96f57e31f90d8b08ab716671c0e6e14ef1a3ecc10e1f286
font_02_sfnt_off00012575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12575 11048 bytes
SHA-256: 32167322ec591445e53b98c03ae78176df2738c3f9fd87fcbb4e7c0d349b84e3

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