Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fcb83d24692e2ab…

MALICIOUS

PDF

82.4 KB Created: 2021-08-15 12:14:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a00f0dc64c79c711be52375f840d0dc6 SHA-1: 6591398bacb8a8cbe723d894db94d122b72112ae SHA-256: 3fcb83d24692e2abc9adda22b793dbd0c2afa473d5ccc1f532f452a4e3bbfcd1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains embedded JavaScript and functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. These links likely serve to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=what+are+some+codes+for+speed+simulator+x PDF link annotation
    • https://octvads.site/js/ckfinder/userfiles/files/64524984252.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/86807782294.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160985da2c37a7---71243737198.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/15a29fc85c53a8183453af6f73dad83e/digimesifuxopifekivimoza.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/40384930980.pdfIn PDF document text
    • http://bdn10.cz/files/file/15210810772.pdfIn PDF document text
    • http://arablift.net/userfiles/file/vuviwivumabipugot.pdfIn PDF document text
    • http://lacyfamilyunity.com/clients/2/20/203fd950dafdada58ea32e7b96f0d147/File/patopal.pdfIn PDF document text
    • http://nhhs78.org/clients/63854/File/47478035594.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/523b90b60fa06de303d6a511131f952e/50415747840.pdfIn PDF document text
    • http://wohntraumgmbh.at/26354636384.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/94466965368.pdfIn PDF document text
    • http://uelzecht.lu/userfiles/files/zosuwetexezawikene.pdfIn PDF document text
    • http://tivati.com/uploads/userfiles/file/dupizexikasokebaxaj.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085034d8c2b5---39932226365.pdfIn PDF document text
    • http://quaint-house.com/images/blog//file/38079756592.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/90303251e34139739a19f25548a8bd61/vikonej.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/284135c5c743130b0d280ed8e6ae3966/62586495868.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/tuxurubotirapi.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/meduta.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/bopitemoneg.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3299d769c---10831723814.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609bee3acec0d---sasug.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_off0000d978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD978 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f18f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18F 10976 bytes
SHA-256: e7cbc921fb6fad2a26a1fda0867ccd1f3ce5ca0bfe1c2b06f355cf39d0257cd5
font_02_sfnt_off00010b15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B15 18620 bytes
SHA-256: 90b1c9a80e9d393d45dae43e4a7fdce5a6ca13f978a6694e7fafa86bc10823b5