Malicious PDF — malware analysis report

Static analysis result for SHA-256 74a72185f07c2bc5…

MALICIOUS

PDF

90.1 KB Created: 2021-09-13 13:03:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a0ec8f5b0fe3bc387c660bf86d4ee3a5 SHA-1: 51e8adbc874e1daeafb35f94da09aea99f2b3e03 SHA-256: 74a72185f07c2bc5576bf5a289da79646646967e43e9cbba2eda7d30f6ec336a
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to potentially compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO abuse. No scripts were extracted, but the presence of numerous external links suggests the primary goal is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/poxan.pdf
    • http://www.fashiongale.ro/userfiles/files/97334837965.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16132bf3b089f9---dodawudutebojaluwirorolu.pdf
    • http://short-story.ru/upload/file/69521724817.pdf
    • http://thegioichuyendong.info/app/webroot/upload/files/sazulotawiguvi.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/d1c6c6585960de441a50e8f3c70cab79/widixitudezuforupadoleji.pdf
    • http://anael.fr/fckeditor/userfiles/file/foteziloguxamupuvude.pdf
    • http://gamaxmotor.cz/data/dokumenty/tiweze.pdf
    • https://mayxaydunghoangphuc.com/userfiles/files/gigabawox.pdf
    • https://megatex.ua/images/uploads/file/3767770112.pdf
    • http://www.huntsvillepr.com/files/files/biwufet.pdf
    • http://zhfangyuan.com/uploadfiles/files/popidawarobas.pdf
    • http://katyababash.com/images/uploads/file/pafemuramit.pdf
    • https://nmcs.ca/userfiles/files/2017505082.pdf
    • http://apartament-krokus.pl/userfiles/file/59029378862.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161354e6c3f4de---larol.pdf
    • http://concilianavarra.com/userfiles/files/jarazelarabimujarajire.pdf
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/92256878630.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/888305fb581d4d7e3af44d4cfefb6dbd/fatulileb.pdf
    • https://thaiwoodengames.com/files/upload/files/85717376029.pdf
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea5f204a1d---91822637082.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353b6af388d---23889473437.pdf
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/78890198002.pdf
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/6675ef736e77b35d74102ac492a3526c/73728948283.pdf
    • http://phutunggiahungoto.com/uploads/files/gixuxozozobebumif.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=frozen+2+full+movie+watch+online+free
    • 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_off0000fc00.bin
60b634c3860b5d600cf19154721d7a31c0b17b5ac17f5fb118aa782b70706c33
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC00 10844 bytes
font_01_sfnt_off000114f2.bin
505ddbd399a32135b4063e2422e14b02687405593dad900a9b54aecdd67b195e
pdf-font-stream PDF embedded font (sfnt) at offset 0x114F2 17596 bytes
font_02_sfnt_off00014227.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14227 16792 bytes