Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d5c53dbfe7f0a2d…

MALICIOUS

PDF

84.9 KB Created: 2021-08-23 12:01:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 279fbf1c91af3f4acd5378c05a615859 SHA-1: 200c7c0b29f8d35ba24c97f9cda8c5a47dc6d3e1 SHA-256: 8d5c53dbfe7f0a2dbd40fb8ed0c4c88affd82b34cf828acb6a2cfae8023f90d6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV specifically identifying it as a phishing trojan. The presence of numerous links to potentially compromised websites and disposable hosting, combined with a 'download button' lure, indicates an attempt to trick the user into downloading a secondary payload. The file's structure and link farm characteristics suggest it is part of a phishing campaign designed to deliver malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.pepinieres-gey.fr/ckfinder/userfiles/files/mafoginiwixapilatixemud.pdf In PDF document text
    • https://clumba-indoor.ru/files/files/nurogipuditorewofuje.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/bonapubumusefo.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac30db89b91---meroginexigomafutolozimav.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/26735175902.pdfIn PDF document text
    • http://carriewoodfamily.com/clients/5/5b/5b9f2fb360c4065436fb7fe1267c3612/File/30003432708.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/fichiers/58174559647.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/18516211657.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/lupiwozugurafejali.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/1bils8clgc6c4lghlgnrjrunn0/xezelige.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/49157736396.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/nudorasemuperadovomu.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/ac4e92fkpn63liav9a1jq6ilqn/62772692722.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/4469eeaaaf94b00dce76d96979734602/59267872551.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/6319639731.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f09eed4a640---lasixemorujawag.pdfIn PDF document text
    • http://washchienluoc.com/upload/file/soxadaretiwa.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/dixewalogufuk.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/39256558132.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/89617953737.pdfIn PDF document text
    • http://clingac.com/d/files/biweviposovedifunumefa.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/zufasekokoguj.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/91147301753.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/49389995920.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=ts+of+dicot+root+under+microscopePDF link annotation
    • 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_off0000e670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE670 17628 bytes
SHA-256: 68dc9ecf85e87fa5c70c123dc505a660a7a897c89feb5bb1802d0943fd95e42a
font_01_sfnt_off00011531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11531 10636 bytes
SHA-256: 66ba580b987a10d00a7082528b187bd4f11063c4bdbb400db9ea6c1f051aa626
font_02_sfnt_off00012d88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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