Malicious PDF — malware analysis report

Static analysis result for SHA-256 14fbdeecd17c0ac4…

MALICIOUS

PDF

69.9 KB Created: 2021-09-26 19:02:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 551b35acbf8c8628f19a61936557cf7a SHA-1: 9c55c84c270bb19741b9463f47f2572d8a368de6 SHA-256: 14fbdeecd17c0ac4722e65299f574af1bfc5a197f92c429186e6e01f145a829c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 http://alt-1c.ru/userfiles/file/30004736833.pdf
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/sogokajejos.pdf
    • https://hophamthaibinh.com/upload/files/35001957981.pdf
    • http://helder-effect.nl/userfiles/file/fogit.pdf
    • https://preprodpcb.com/userfiles/files/nutut.pdf
    • http://n-production.com/upload/fckeditor/file/tabogox.pdf
    • http://mapect.com/upload/fckeditor/file/fixozavonajiluvigowesa.pdf
    • http://www.tomasjelinek.com/img/pub/file/giwiv.pdf
    • http://hanabi-la.com/uploads/files/jexuk.pdf
    • http://www.europesolidaire.eu/userfiles/files/44281313434.pdf
    • https://corpeverest.com/ckfinder/userfiles/files/nerefijibuzerex.pdf
    • http://www.toptehnik.si/images/vurogixobazawinudekidojel.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363afdccc92---9065811512.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/0246ca455790b90369fa6618a949c6a3/87132965859.pdf
    • http://stilna-ya.com/_userfiles/file/10497658514.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16145bac44febe---60458851917.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145003af1981---pederukurovoxurarixefezi.pdf
    • http://eltprof.ru/userfiles/file/sejosufitikafisesagi.pdf
    • https://okud-istra.hr/userfiles/file/rumexamelelirenubepona.pdf
    • http://koutingchina.com/upload/files/30370933152.pdf
    • http://profitoolinfo.ru/ckfinder/userfiles/files/26952919279.pdf
    • http://chiangmai-clean.com/user_img/files/71991434965.pdf
    • https://usgcambodia.com/userfiles/file/83207599096.pdf
    • http://primeasset.hu/fileok/file/53461883262.pdf
    • http://sugarfree-gelato.com/upload/file/51051108873.pdf
    • https://stpeterscbs.ca/ckfinder/userfiles/files/mijuvuxivukovokurigixeri.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=escape+game+apk
    • 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_off0000b296.bin
8fd101b4d365d0f0b9e9bcfdf3cbd76f1439407b94de62c9aa05b5c187fb6d65
pdf-font-stream PDF embedded font (sfnt) at offset 0xB296 10232 bytes
font_01_sfnt_off0000c998.bin
c5aeb48fe0019662a4638725213574fb9129755893a3aef582d27e8107d24365
pdf-font-stream PDF embedded font (sfnt) at offset 0xC998 15904 bytes
font_02_sfnt_off0000f232.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF232 16792 bytes