Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d9f3ca8e7dbea26…

MALICIOUS

PDF

82.2 KB Created: 2021-09-06 23:18:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e2205a7139b1dbaa1395fd356bbdbdba SHA-1: f3fa224ffe14f5cf55cff10971c66d85edf4f7be SHA-256: 1d9f3ca8e7dbea26ea0b9d225b6e526760b33a836b2f487dccad0a86bcea613e
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple distinct hosts hosting similar PDF files suggests a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/e3326adb8c726bf1578661b954c3da09/20215483916.pdf In PDF document text
    • http://amindoost.ir/images/upload/files/83767382753.pdfIn PDF document text
    • http://rilta.net/userfiles/files/6985320391.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/53784008098.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/28351848811.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/0b1eb37b5382678fd3709c13bc410a62/6544747395.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/ehp9himqs4h00t72f8kefdnvj6/bemono.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/vuohculajvkra5dc210la928n3/30569530285.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a56a783eec---xulusezemageteredojaxavu.pdfIn PDF document text
    • https://tecnomatec.cl/upload/file/gakefujujefiloximikor.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/lejememeguv.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/18647283959.pdfIn PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/subivebajogurifabubipuga.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/762074007.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/72546413478.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/19098000296.pdfIn PDF document text
    • http://e-restauracion.com/app/webroot/files/uploads/files/xunobexanekiparon.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e87a7bc94---momavuxeku.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/d67b2bf2cffc6d6302ef8d2778878af8/25486180150.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160d03ed4d5aab---76043627080.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/nukizeretizisamir.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/11608af05d634b930594674c6f6643bf/xisetebabanutedemiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=detergent+powder+recipe+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_off0000db83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB83 10504 bytes
SHA-256: 17f43927891aa40e26bf085a0b01b0ee75dce22fb0e4a128334959510b3f6748
font_01_sfnt_off0000f360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF360 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B72 18392 bytes
SHA-256: 3a6c9015ed4cd8eae710101c5a2babe72f0a94cc8a6602593227a87d8c92aeca

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