Malicious PDF — malware analysis report

Static analysis result for SHA-256 158c8ad48ba01a25…

MALICIOUS

PDF

86.4 KB Created: 2021-08-23 14:49:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: bce82c004f831b90eed7cfd66b4562da SHA-1: 95b1661ec4c589b62526e9a85bcf05bf73e1a941 SHA-256: 158c8ad48ba01a25356b38ee538fb308de5cd5171d28f8c48f551f0aa5a3e8f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further support the attack pattern of luring users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://wastran.ru/uplcv?utm_term=sample+of+a+proposal+letter PDF link annotation
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16080c9f3d2279---zewuvunagimolapozabulirag.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/42146263485.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/kuxomonevovezovelowusalo.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/84954120589.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/33262314899.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210705_3AA04DFE7E9C1834.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/73997611758.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/83801291691.pdfIn PDF document text
    • https://sealskinz.ru/files/file/kadipin.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/10313022652.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/87526808581.pdfIn PDF document text
    • http://parilka.by/var/upload/file/bobisamamunuverisil.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/69d35d389c883acc09d55023dd7c71f6/6679051761.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d8871aebc---39336732684.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/facf2358ec5a4b120f58651365bda427/10177118758.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16119187b7f602---59872081415.pdfIn PDF document text
    • https://familienarbeit3plus.ch/userfiles/files/63665521630.pdfIn PDF document text
    • http://salondebellezaanamariaromero.es//ckfinder/userfiles/files/gipitabiganizo.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16086aa8d35e04---23197071932.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f082f79cab3---68508536082.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/netezonepikewixuti.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/9378414940.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/kunuwerofaliv.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_off0000eea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA6 17700 bytes
SHA-256: cd4b248734b3c819401be128c76ea9fa00b5b716b23725f9fcc0baa04f1e7113
font_01_sfnt_off00011d08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D08 10396 bytes
SHA-256: 65b0498d772dc3f4e3328a0ee34d3a15fb81947a6008d0701b323ed70d7863d8
font_02_sfnt_off00013492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13492 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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