Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1d97906b26620b0…

MALICIOUS

PDF

80.4 KB Created: 2021-09-14 04:31:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eea6b47cf25d79a143529f9095e7a05e SHA-1: f5a1e3c3e7b5dd5ec28e51f58d58367ac26e6610 SHA-256: c1d97906b26620b045637380d67a3a80b7d63d9ce0e9374e85a794a62648b3a5
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL distribution are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://metrosecuritynepal.com/assets/userfiles/files/pibak.pdf
    • https://carrieres-pierre.com/userfiles/file/kipatitagu.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1613667ff120b1---17841880504.pdf
    • http://reversetheclocknow.com/ckfinder/userfiles/files/rebewoxunafanuloki.pdf
    • https://allianztc.ro/files/file/7742361936.pdf
    • http://kapelski.pl/userfiles/file/nadumeguvebiwiweriw.pdf
    • http://mstreatmentadvances.com/userfiles/files/fazakapevuxeworeva.pdf
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/4171154985.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/161384f1252fd3---23699531344.pdf
    • http://nextgenship.net/upload/file/20210906163096567380.pdf
    • http://bursaceyizgelinlik.com/images_upload/files/samifovosizadi.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613d37da39f67---wuzukujotunevalozoligome.pdf
    • https://liepasmuiza.lv/userfiles/library/lurokaxemoz.pdf
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/94036089070.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1613248171df67---96132516379.pdf
    • https://astoraccessories.com/uploads/ckfinder/files/94796039203.pdf
    • https://martas.vodrsport.cz/uploads/files/73737623265.pdf
    • https://uslugiinzynierskie.com/eurostyl/photos/file/43190129894.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613203b720154---16642388373.pdf
    • https://oilbasaro.com/web/images/ckfinder/files/20210910171824.pdf
    • http://fantasymusic.it/userfiles/files/disaninadivisuvatowa.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=setup+exchange+activesync+on+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf21.bin
2715cafe1584419bd4b621124d0d92fb1b29f55d001ec7e43d4e081d31323ead
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF21 11204 bytes
font_01_sfnt_off0000e928.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE928 16792 bytes
font_02_sfnt_off0001013a.bin
60c031530e58c8c77414c03e393d46c98d0845ef5da337d131d89d84c6483366
pdf-font-stream PDF embedded font (sfnt) at offset 0x1013A 19496 bytes