Malicious PDF — malware analysis report

Static analysis result for SHA-256 b88437cf9814bdca…

MALICIOUS

PDF

83.3 KB Created: 2021-07-20 12:00:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 825bb5a34e08a2bb96dc91772b9e2642 SHA-1: 68669f3c4dac92c8e5652ceda26d05a0309e2aef SHA-256: b88437cf9814bdca87bb9bdf800442294776dda015d839a4abd0232b281eef49
164 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL findings are sufficient to infer the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/2pv88m19h800upk7fjt81pnvgu/vevijufodopigebamubupa.pdf
    • http://effektfilm.de/files/file/23404196544.pdf
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/47538020115.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/mfklmkv8m72jjtm5omt5o00es0/95043140324.pdf
    • https://ncsccalgary.com/userfiles/files/tazubokepifuvigu.pdf
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/14180842235.pdf
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/xidonivuvabe.pdf
    • https://jodhpurtravels.com/nbloom/fckuploads/file/kabenitugedafirubogoke.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/f1103382bd5c346c4a59a7fd783ec28f/rilugamanoj.pdf
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/d4df6bdc1c41162b6bf968037957185a/17484137697.pdf
    • http://alrabbancapital.com/file/files/fupomazutemiwab.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d241bc19e---gevumufofogekiriliz.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084075016c7c---32983027302.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/3nk00gn73it3t0f2ihvud2tvs3/dulojug.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb89d66629---72588635530.pdf
    • http://poiskvod.ru/images/file/fewezodusebujasewamefik.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16075f2063737e---45138760.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/49463e2a9f07cc113d8c0dfc90c43b19/76755699016.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/2b9p2nuhe1k8r55f9snr1ql2r9/xigikesewefexosakosajas.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16085a6bedf840---jamalisifunuzodu.pdf
    • http://ridendo.cz/files/file/ginegulad.pdf
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/4a5d54f049a88273ad283801723f1b00/16744919925.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=funny+tooth+extraction+gif
    • 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_off0000e428.bin
854cc8b0c284188c70fe5ea584dba2d500f3f8e15c9d47ecd2d31132ec8ded51
pdf-font-stream PDF embedded font (sfnt) at offset 0xE428 10692 bytes
font_01_sfnt_off0000fcb1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB1 16792 bytes
font_02_sfnt_off000114c3.bin
271342c4b0ec75bb186ea3179e959196feffda67cea49fe9b2e6288c744dc6c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x114C3 16612 bytes