Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a995a30d27075cd…

MALICIOUS

PDF

87.2 KB Created: 2021-06-27 23:34:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 85e534c5f19c9e074dffc2412219dc9f SHA-1: 0c9f9220efe6f5ca173649d6bd1108af635cd29b SHA-256: 7a995a30d27075cd5846cffafa5cd0829b411191ad168e201d2f65f7aabe2c7c
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure as a link farm suggests it's designed to lure users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://coretry.ru/uplcv?utm_term=agile+project+management+creating+innovative+products+jim+highsmith+pdf PDF link annotation
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/e1be0aa8d7a11b623e89baaef597e1d0/gobalisudokadelajarujoze.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/42140661588.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/boluwirarenebodowobuloje.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/d029096b5fb98a758d721b3b17957402/wudeviro.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/12706420138f27a194a41c13008a32ce/gididijulijamasiloginubow.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/20n4044ut11prno3t8kn2im0s7/84595101231.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/pelibuwamozujexerojew.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/dq2flp3pmti52kna0d31l6b3am/63497223976.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/3338393964.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160d02ba5353d1---jiferowaz.pdfIn PDF document text
    • http://biotop-zamosc.pl/userfiles/file/fumodifuwagusovateke.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a6149fb0141---ligiden.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f496723ae6---26836197527.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b61c06c428d---43106332732.pdfIn PDF document text
    • http://quaint-house.com/vivajofupevumigijifus.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607b33bd1eb2e---14080989907.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe915caba1---gadikozozexipofugi.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/9dee2ec7f473e47e4910874085f1d92a/9774123587.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/vipudipeberajuxij.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160afceb1c894f---33219945643.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/71621ef1e3a8e3fda88e3c31328d10be/65329751567.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210526235319.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/89036269729.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160901a8a32a5b---pediva.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfa7b9bdbf---53410007781.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF005 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10817 17124 bytes
SHA-256: 6e1abcad46179f9596a27bddb5f9a28bea1b2e03586f4a9ab3c5f5098c2c9125
font_02_sfnt_off00013489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13489 11344 bytes
SHA-256: 7b46612af153465e749555d1da77a801ebc9f0e011d1971904617284488d3db0