Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ec771754848b476…

MALICIOUS

PDF

86.4 KB Created: 2021-08-02 20:47:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 081c9efaf1581473a26f04dea0f5038d SHA-1: 1d93a55e336180763481f65d8e237cbbbe047318 SHA-256: 9ec771754848b476763794a5e2fea4999613c5de889d9cd7625483aeaf4c9ead
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains a link farm pointing to numerous compromised WordPress sites and disposable hosting, suggesting it is used to distribute malicious content or redirect users to phishing pages. No scripts were extracted, but the presence of numerous external links indicates a likely intent to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8943c4087---96212690584.pdf
    • http://ohsclassof73.com/clients/9/9a/9a21b0b253f7c4eafe662346d237c286/File/76925050440.pdf
    • https://tecnibat.net/uploads/archivos/92962834912.pdf
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/317r8cek5ef7etec0vlr7l4f1c/furibakefomaxazimikadar.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/nbetdsurl3gc5a9iu86quok5c2/1051874243.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0f52402f9---vasuwokuvegadofulujep.pdf
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/8f670176ef3bc9eee9d5a08074103825/21631705359.pdf
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607baf5843999---20605634965.pdf
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/1a33ad6ad4e682e34798e39f3213b4cc/48818075821.pdf
    • https://hiroyoung.com/data/files/20712750935.pdf
    • http://cafehinglung.com/uploads/files/50647065399.pdf
    • http://kruengrangthai.com/files/files/kesizifawawesonopefe.pdf
    • http://ausafe.net/images/art/files/nedosozexariki.pdf
    • http://wearebryants.com/clients/3/3b/3bb22ab34fb8fe691aabc4d0498f9caa/File/lejopixibuvukagomukijuk.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/pquri5ijmg1m0oum8klihu9ml2/duxofate.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9c9296152---jaxonakokawigipadovibuxen.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/v32a766eta1pmai3ljc72c7dcu/menososijafikumapelosaja.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160cb81b788fe1---12241890456.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b733265e3---9912388740.pdf
    • http://tekizolasyon.com/ckfinder/userfiles/files/ratilifipuja.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a53ff28518---61973229962.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a1dfb935ffc72045dae06d19a4759a52/62759445438.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/velqeh3rqi0nsfjn6dujaa5cop/zevosugof.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=buet+msc+in+ipe+admission+test+question+paper
    • 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_off0000ed7f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xED7F 16792 bytes
font_01_sfnt_off00010596.bin
ece5d6946710d0c96b6e3b26da08051199a3e5bf0e1b25c3e3a9368249c02116
pdf-font-stream PDF embedded font (sfnt) at offset 0x10596 10928 bytes
font_02_sfnt_off00011ead.bin
1725eccf3e2d59ef4bb2f735b259c31929e811ce9772497eeaeb022e40a93fb9
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAD 16576 bytes