Malicious PDF — malware analysis report

Static analysis result for SHA-256 8960e22a4f616167…

MALICIOUS

PDF

84.1 KB Created: 2021-08-28 09:32:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f2270be05358b55e3f6d1460cfc6517c SHA-1: bc4f4557c171b0c56f89ce34e0af18aed3d3b16f SHA-256: 8960e22a4f61616729f676952b3bf1a83386e615fb8179fe0eb1eaf5c977ffb8
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to websites hosted on compromised WordPress installations or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and URL analysis confirm a link-farming and potential phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49600262628.pdf In PDF document text
    • https://sankaibearing.com/userfiles/files/vebutegisikan.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/d54378d54cd7a6de4cdcd61f3ad91951/kenurusavusugedimen.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16090189a13147---nelomokawogezaxelubele.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160ad34d24c379---boresalixevemipov.pdfIn PDF document text
    • http://eis-pieschel.de/UserFiles/File/vadetonavajebupepaje.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/52704306492.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/63842776458.pdfIn PDF document text
    • https://immobilgold.com/file/16297712014.pdfIn PDF document text
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/54692847645.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/309c470f464dc34b95f246433ec6e814/zubuviko.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/56722548773.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae55c2d9766---11461579084.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/f65c47e17bea132f4e06191119b7c082/88598954089.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tipopiluveviwevix.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/molefanetugigedesiguxutaj.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b12ccad3066---naxamowozodulato.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/28579330430.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/0f4a4b320e3787a82027fa382006e512/walexiwuk.pdfIn PDF document text
    • http://nakatka.com/files/file/99250949550.pdfIn PDF document text
    • http://xibuhuanyu.com/filespath/files/20210825011314.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a79cc8e0281---wunofiwerapilogelijizome.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/2a52872edd41c4cc74485e15020a788a/taximoxogegilalenura.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/xovavadazesusariri.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b08cc6a1e5a---34579075705.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=the+lonesome+mouse+tom+and+jerryPDF 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_off0000e340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE340 17576 bytes
SHA-256: 1088edf58c5c55d914872a9c44881c4f6506ef6e407994a43dfad7a81dacc5a3
font_01_sfnt_off00011140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11140 10728 bytes
SHA-256: ca9829750124c130904cc20fb919bce3208d8dbd0022ab90a664faa1c24fb3cd
font_02_sfnt_off000129c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1