Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5128ec1ddc3a765…

MALICIOUS

PDF

84.1 KB Created: 2021-09-16 04:13:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7654b6f90d69826174a0479ff53dc1a6 SHA-1: 12653ac0a741241120653557d98237b7be432644 SHA-256: b5128ec1ddc3a76528d663ac1dd9888b3d47fd1e4935b94d6bf631920832bb77
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL analysis indicate a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://avandcie-automation.com/ckfinder/userfiles/files/zifujagifawon.pdf In PDF document text
    • http://egitara.com/upfiles/files/wikivodokokudotabexi.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161403a397901b---viwinizekunezedavovefive.pdfIn PDF document text
    • https://cultureresortpokhara.com/assets/userfiles/files/41628750657.pdfIn PDF document text
    • https://masihpt1.com/contents/files/98362240396.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf94f17d90---widewotezagupu.pdfIn PDF document text
    • http://adamex.ukrkarta.ua/fckeditor/userfiles/file/sozukuxiluvaxekadug.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/98224710613.pdfIn PDF document text
    • http://reckdance.pl/userfiles/file/99925689427.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/93693036192.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f35d241e5b---nuxelavizujavuw.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/lonab.pdfIn PDF document text
    • https://tidurmalam.com/contents/files/39051586026.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles/files/48148709596.pdfIn PDF document text
    • http://tuvanthanhlapcongty.biz/upload/ck/files/vamizaralogeb.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/te0frf7qsdb1kbl0k9cgbc43oi/kidepona.pdfIn PDF document text
    • http://xn--4k0b43gkwo4gn.com/upload/editor/file/posuzop.pdfIn PDF document text
    • https://kristaldicarlo.com/userfiles/file/43872669346.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319fd468c2f---42466515048.pdfIn PDF document text
    • http://filipdegreef.be/uploads/files/15122176492.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/nufotabuxenipozameropu.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3d18ecf3d---33957657851.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/bedixoxuje.pdfIn PDF document text
    • http://pietroquatriniarchitetto.eu/userfiles/files/15803207683.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613730b6f3899---42505331226.pdfIn PDF document text
    • http://getwealthythisyear.com/ckfinder/userfiles/files/77965284684.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210904094656.pdfIn PDF document text
    • https://karlschool.org/uploads/files/202109151706307874.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+delete+kodi+on+firestickPDF 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_off0000e3f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F3 10476 bytes
SHA-256: 30ad8e6a4496e0937e1a6830931acb5ca75c1ce4468462447e8572ee0a407fad
font_01_sfnt_off0000fbdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113EF 17768 bytes
SHA-256: eb602818df2c9246221536af046b022b9a4e8050297d09ca4dcf4b3e93ed43b5

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