Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c80ee9e52eaa9eb…

MALICIOUS

PDF

93.5 KB Created: 2021-07-08 08:55:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 17723739845f1015ec8c0d8b17ab89b7 SHA-1: 48dfb7d7581151cabbe674ddfa20d890b9ae6943 SHA-256: 1c80ee9e52eaa9eb937e588991809a1ab4ed789bde5e7536cab96819421b759b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm pointing to compromised websites. The PDF contains numerous embedded URLs, many of which are hosted on disposable domains or compromised CMS upload directories, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the overall structure and URL patterns indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://elitaliaweb.it/upload/file/mixoporita.pdf In PDF document text
    • https://oumkua.com/userfiles/file/voxazilija.pdfIn PDF document text
    • http://pvvc.cz/files/97607746504.pdfIn PDF document text
    • http://dashoernerboot.de/userfiles/57926117651.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/94jbk2c7fo8khbdu3fbjuoand8/34539815878.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/kschmc0m4pnhjljohh7v3h2ef3/kuwubigikitibuve.pdfIn PDF document text
    • https://prosperitas.be/data/assets/file/sazuxumufimovogol.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/9678857122.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/38550631644.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/6337012469.pdfIn PDF document text
    • http://re-view.online/fckFiles/file/95452456681.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/vodopoxek.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/newubujinowevu.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/0f28fd1c1df8aa82d4d662cfdd8e4b82/sosuro.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/lujetawisez.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/11850129896.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608944d65d915---6084326985.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/f5dbcdd8a1bf02d2fc8d8dd375b3b334/53495868423.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a80de638e08---80559909155.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4d7526434---lidofa.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/43a160fad945d3f999e7bf6de101f1a8/gokiwubijudizifekiferov.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/4b10ccd77ff4577e67916ba35e9a06b7/32233201041.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ace87d42b---zisemo.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/cd6f03efa0886976abb7b7c0576271fb/rupuzi.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/vigibudu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=i+want+to+introducePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B09 17672 bytes
SHA-256: e09b64f4d6b915c0847e32f5dce1eee74f51f8f8f392236b32efe6b12d08f07a
font_02_sfnt_off0001398d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1398D 10288 bytes
SHA-256: e0830c9136236196ea206ed7021409dd60922757dd2a00ac73d1bda9c2b0f752
font_03_sfnt_off000150e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150E4 16340 bytes
SHA-256: 88a5f3ad9079b2340172ecd64f1cd79ba1ad1753eb2b73e58de10c5a7be67d15