Malicious PDF — malware analysis report

Static analysis result for SHA-256 79f2a57e42866890…

MALICIOUS

PDF

84.2 KB Created: 2021-07-02 02:20:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f47294d5601878a5f9e554556d5b2cbb SHA-1: 9d666122b7127946cd1b6125ab7da3673ca0f6a9 SHA-256: 79f2a57e4286689051a4e86ba7b2df15e2a733c278c112569b3e560274c97e25
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or conduct phishing. The presence of multiple external URIs and a link farm structure strongly indicates an attempt to redirect users to potentially harmful websites.

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 https://ketchas.ru/uplcv?utm_term=hitting+ganglion+cyst+with+book PDF link annotation
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832bfd91790---gedupilipetikikifunuliku.pdfIn PDF document text
    • http://matras-devison.com/upload/file/kisowevimafoluzigob.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/fibetaxabumekex.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3cd734ebe---nuvatajemasibapexiz.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/dh1193dcef8usbtvio5m488elc/70762266448.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091b4f0cee5c---ripelojebomanesefofe.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/tesajalezixagot.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/b20caf9a79e4b43e8153195bf53e391f/11478789289.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/46742868216.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/55369364394.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608038f9167d4---zegixovofala.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609224ae0ded4---60639379017.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e396fc7d48---88926036157.pdfIn PDF document text
    • http://houselandia.ru/files/gowejekelip.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/pagudemegipuroteduf.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ab78e41ef94---79544924032.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/ac020615f58b222ff4209850894adc64/mijufoguzeb.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/19595920351.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/wobemavevilif.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/1d46d2f634d0f54f65df499cb5bd3e6e/duketosenaxebebirufe.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/1rb50v27ljrthadel0ak199j8l/papufuzabepem.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/fokokadenorowokidurimo.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/74170839950.pdfIn PDF document text
    • 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_off0000e7b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B3 16652 bytes
SHA-256: 6cbb2f5df2a8c2a90042e3b60ecf57a3d6bace386a7a43d9c1ab542d97c56be9
font_01_sfnt_off00011320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11320 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B37 10700 bytes
SHA-256: 0e43931f2d0b9bdba83f12adef86e49a9baaccd375aecc8cadac64fc245181ea

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