Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a07a84cf70705cc…

MALICIOUS

PDF

79.1 KB Created: 2021-09-22 16:14:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a73f43b2a189739a2e598edfc98128da SHA-1: 04b8357f028e790c5b8fe318b047e3430356c600 SHA-256: 3a07a84cf70705ccdb6ac168dfdf46381febfcd6055795e871adaf2b6a273eb4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to potentially compromised websites and disposable hosting, indicating a phishing or redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lead users to further malicious content or exploits. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/cf2585b7c09fdf1235c821f54016e82c/88711311739.pdf
    • http://bamboomfi.com/htdocs/cljr/data/files/52735210672.pdf
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/67246360943.pdf
    • https://europacreativaeuskadi.eu/files/galeria/files/waribariduruvoge.pdf
    • https://ispartaorganizasyon.com/ckfinder/upload/files/josefanateritozisewimad.pdf
    • http://umffz21.ru/admin/ckfinder/userfiles/files/tobedarametewuj.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135943f4eb7a---96067923895.pdf
    • http://zwickerfoto.hu/_user/file/rinesevilavifurakijaduxod.pdf
    • http://oawebserver.com/piceditor/file/tixumezufadanokozones.pdf
    • http://pronobile.de/catalog/file/wemoloro.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16148058f250fc---87138179962.pdf
    • http://botosani.ro/img/uploads/file/besibonaviw.pdf
    • https://classoft.ro/userfiles/file/83783688059.pdf
    • http://ranaghatpchsschool.org/userfiles/file/gaxinivosolos.pdf
    • https://sukienmiennam.com/userupload/files/22853044972.pdf
    • https://autonoleggioassereto.com/file/64006683197.pdf
    • http://rafaelstore.ru/upload/files/motariz.pdf
    • http://www.reeder.ee/files/filemanager/zukufis.pdf
    • https://hattshopping.com/admin/assets/images/ckfiles/ribafi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=pubg+mod+for+minecraft+pe
    • 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_off0000cd63.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD63 16792 bytes
font_01_sfnt_off0000e57a.bin
e17466fd0d41206165e23e75edeb0aaec373fe4e32cd97a8862bba9395cce71d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE57A 10992 bytes
font_02_sfnt_off0000fe8d.bin
2f1432cc725941f9f3f2f45b56146bdfde71de2538c62357aa07f3760ed51deb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8D 18528 bytes

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