Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6da2c96d6bf51da…

MALICIOUS

PDF

88.9 KB Created: 2021-07-03 13:25:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 450230038a5b0b9dd8dfef0b8f850039 SHA-1: 9cded54cb50071303742c65237924db51c4c207d SHA-256: a6da2c96d6bf51dae3c31b25febb22259348d6130654431ec9dda47804f30ceb
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains numerous links pointing to compromised websites, indicating a likely phishing or malware distribution attempt. The presence of multiple links on disposable hosting and compromised CMS uploads suggests a tactic to obscure the ultimate malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/f7d144fc4a1ff71f16f89bcd29b47d37/56416035453.pdf In PDF document text
    • https://aterhesseg.com/up_image/file/21406328473.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/malujaroxekitipusofubi.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c59ebdf0619---32547683925.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/14088064499.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/45420649753.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160982eb06b967---vikulikenagire.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/5p8ea9hoqp8ec5f17rve4j2mm2/43441832429.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/f6d0a795023701ee99ccb9a0665fa95f/dumomulufunilal.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8d68afac7---jusobapifebid.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b14a113e0f8---36578335004.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/34191594336.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/cc9128b6f59f2f3285ff4a574adec039/79822134116.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/df4c1487bc3b759d07fa4c36d70eeb80/fufubabosesinet.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a276f991780---76260917155.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/kezelefagizusura.pdfIn PDF document text
    • http://burnettefamilyreunion2021.com/clients/867108/File/mojewulusufojug.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/usqa640pup5b4dcnqlli1b12a6/84591949011.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f305dd7cc7---zurepekikanidefixeza.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16080cff3119d2---10527034013.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/19207403372.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3d37160459125e2ae89c4a0f24ccc407/juzomulegimunesurolifoval.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607718b247dc2---gogedakojun.pdfIn PDF document text
    • http://parishad1925.org/ckfinder/userfiles/files/71301673727.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=indian+cauliflower+and+potatoesPDF 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_off0000f659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF659 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6B 17748 bytes
SHA-256: 035d388ff459e4ee17a792c7d9f2f69c13aeb5de621d7532078602b8aeb75684
font_02_sfnt_off00013d3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D3D 10752 bytes
SHA-256: 83eaa1a26f61e8a78b723579ce23c8564ca1e18f11d9b5a62bc2ec00b7b50896