Malicious PDF — malware analysis report

Static analysis result for SHA-256 86dc52b3402dd961…

MALICIOUS

PDF

73.0 KB Created: 2021-09-06 09:56:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 697f73719f6a3d18c5d72d13b31227c5 SHA-1: bcac8c5803535bb7472c31daae515e58a1ebe91f SHA-256: 86dc52b3402dd9616c9f5d3d3ae6d129d438079fcb68bdbcf639121839c589b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to potentially compromised websites, many of which are hosted on disposable domains or use formcraft plugins, indicating a common tactic for distributing malicious content. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links suggest an attempt to lure users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://alanaf.ru/userfiles/files/golagedanowinux.pdf In PDF document text
    • http://castel.lu/userfiles/files/pijinenekugazimojixaje.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/523387594.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/32118693878.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d51e37cb41---97591780183.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607574afa1c03---sajujalilezenilelas.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/dikanuxuxojaparuruwexaf.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/48627964210.pdfIn PDF document text
    • https://nileagriculturalindustries.com/file/mepikoninubu.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/4d3fe0933eb85af511903a3e625165cc/binapudop.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160cd065f8c908---noxabaloxuwow.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/90e5bd23d354072ca673a2d6a3ec0b3e/natumasebafezubo.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/28110769e59228f4544788de5c5924a0/22778022392.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/76553269137.pdfIn PDF document text
    • http://floral-design-lindgens.de/userfiles/file/88966890160.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/d82ba3aaa3730adab2d88add3096fce1/46687202335.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/ddb3cd502e7b572496cfc41ae640af1e/71528498576.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/rel98fd995fqdi337u4ojrr3h1/1236739617.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/7a48bb5f7f20e6c94e412ad0eaec57c7/bomesogonemotebonezezavij.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/jolakagave.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a1428cc91d9---niroreze.pdfIn PDF document text
    • http://debden.org/userfiles/file/zegabenovodukulemalemape.pdfIn PDF document text
    • http://hiddenroots.org/clients/19739/File/xamixosavo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=ultrasound+physics+books+free+download+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA03 11256 bytes
SHA-256: c26b6514f6eb63c439a5bb8aa33a14fe0c13178d0aaa8ec24d3db9b8510ddfcb
font_01_sfnt_off0000d439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD439 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4B 16408 bytes
SHA-256: 1f640a66f0a6f06df3811438b477c640493e395768f5e7fb30663f36bb6730d0

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