Malicious PDF — malware analysis report

Static analysis result for SHA-256 45698b86d64a9c1f…

MALICIOUS

PDF

89.0 KB Created: 2021-09-03 05:49:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 35503d4c7cf4b6d25df22e48a2c43b78 SHA-1: 13e50d39e71e8519539ab6110e5aee4da5cb0e90 SHA-256: 45698b86d64a9c1fd1f2090e758e4896d839773fb9a23d94f1904ad3e03bd424
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting it's used as a link farm for phishing or malware distribution. The PDF structure and link farm characteristics are indicative of a malicious document designed to lure users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/0c0042cd46346b3c126a664b48037f59/65360143808.pdf In PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a22ea372f4---xupudemowojef.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/519672a037922f440fd0383a012a4b3d/98929445215.pdfIn PDF document text
    • https://scalper.ir/data/files/file/37727844262.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c479606db---29578050679.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9de8225694---16275817962.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4b3ed9221---wifojo.pdfIn PDF document text
    • http://hoangminhceramics.com/app/webroot/uploads/files/jebukawezuvibeg.pdfIn PDF document text
    • http://signauction.net/userfiles/file/66313335647.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160baf374add89---jerafoximemeninitedezuxit.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/86802381811.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6bc34ef480---gopafovulugukukutesoga.pdfIn PDF document text
    • http://inlygiaylynhua.com/upload/files/94429700940.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ff48bf86a---mivetedumorefu.pdfIn PDF document text
    • http://sevvalturizm.com/rsm/files/30401900955.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///21288774800.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/ferapag.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/c1d914676c2178efdde3811ed313dead/73364818337.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/segezigefa.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/c7lpnv4ro4qkkp8th9fa3ijs2p/78893289192.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/nelugezan.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/werozunipubipirutaz.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/a07ngpet56mr5426bils3bja23/61098264532.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/losenavalet.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/00a3f988884b8ae73266df239f0155b9/surajepipokijem.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/b5s7kshe4m1l62udoc888qhdmv/89816719362.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=ley+de+inquilinato+ecuador+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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D03 18924 bytes
SHA-256: 529dbcf57dd49c32f86409fffe5fd0dc6893470d1a7c256cd8bb90371a7f6e33
font_02_sfnt_off00013d78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D78 10764 bytes
SHA-256: a62dbaf5981554692b257bbdd33c0ee573a7bf60cff49e60344f7bf14e795965

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