Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe9fbec3b0e9088c…

MALICIOUS

PDF

84.7 KB Created: 2021-09-06 17:58:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ed762b7207c03323cc7a52a924e8ac95 SHA-1: c715e77a850696609eb5cc470f95434744db3dbc SHA-256: fe9fbec3b0e9088c883c695598ef4da5a363f22ef1289bdf0b4cad29479a45e6
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://synerhu.ru/uplcv?utm_term=bissell+spotclean+proheat+pet+manual PDF link annotation
    • http://tomaszfilipczak.pl/userfiles/file/29732464239.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/19097362811.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a3689981796---67174342825.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/wuragojofavupimixewenijit.pdfIn PDF document text
    • http://utopiasacramento.org/clients/0/07/071cdeedc048305be324eb10ab8031d4/File/saleluvununepo.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/89015979882.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160751c62b4729---76274451728.pdfIn PDF document text
    • https://activepymes.com/pub/file/3622589899.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/2f62d472aaaca21ae775624b96253523/38399638960.pdfIn PDF document text
    • http://mav-auto.ru/images/file/8774631344.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/dibibafa.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b45f61c04---21206077342.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/4fd789302a99591ec8d68415aa78dd3d/sumexirolalomubatub.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160962eb8d3e1f---30778341786.pdfIn PDF document text
    • http://kco.su/userfiles/file/68826124527.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/rexamanaxadozaxufakej.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16087120695a6f---safugukajuveseporavumap.pdfIn PDF document text
    • http://feast.to/upd_file/79817764672.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/7dd9dfc63ee26a28a24076f6b728b72d/jenenutonilagozomoruxa.pdfIn PDF document text
    • https://samavetah.com/ckfinder/userfiles/files/15340938479.pdfIn PDF document text
    • https://francemonde.news/UserFiles/file/21519273321.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/taxasigamev.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611fcf2c222c5---duwixivakerijamupojejasa.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_off0000e488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE488 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9F 10792 bytes
SHA-256: 69eb2a3e0b469f152e4cacd32ffd2981e3ff8f9942f1fe7518b36e56d00dab9d
font_02_sfnt_off0001154a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1154A 18740 bytes
SHA-256: 4b4994e5ae69d018b0765b84a54e89c263d866d2f2b7c3f273001e51da7cd4a5

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