Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2e770ccb28d0e27…

MALICIOUS

PDF

90.0 KB Created: 2021-09-02 17:56:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2f1d998080ddac87cf648897df36e152 SHA-1: e801d30a7340109886b8428ceebbd6bdf5250ea5 SHA-256: a2e770ccb28d0e27faaa278fc9f0e0934f9024c5ab73ed9df29964f3291beeb6
164 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to other PDF files hosted on compromised websites, indicating a link farm or distribution mechanism. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of external URI heuristics and the 'link farm' findings support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609137fba240a---84666642316.pdf In PDF document text
    • http://archinfo.ru/uploads/file/48630023659.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/vulovafaruvakutedokes.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b0fcb7d8cd2---sutevatenununuronoxo.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202108220854123583.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/42136597624.pdfIn PDF document text
    • https://congchungnguyenlieu.com/uploads/files/92608353836.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/r348nei9ucqbab81nivfoh9na1/41814393359.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210628_F7E25C9E093496AE.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/kogokijulokuvalalox.pdfIn PDF document text
    • http://forspeed.cz/ckfinder/userfiles/files/susimofurasepuko.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160862d9304917---vifudo.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf2c5c023f---pipigexepodofofonesunixe.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/17711154150.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/sizedaxoxotoxupubamewol.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/dcf742f072f797b1318a5e0436543ff9/raloworuz.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/89869102879.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1607330833c199---51601583993.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/949159617.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160b5fd7e25659---pekapadu.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/fbda885be3e6c3312f67adf4c2a5dc53/35829024984.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=barbarians+of+lemuria+pdf+downloadPDF 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_off0000f38a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38A 20448 bytes
SHA-256: 56eccd52c74588242ab2127ac7b09016d485c198d336b6bf06ccfd3a5ab7349c
font_01_sfnt_off000128bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128BB 10940 bytes
SHA-256: 77ae16f2d3a26032fb9f6144f3f0a5761f79d56e198e3aee3b9c2121ebba22d1
font_02_sfnt_off000141e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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