Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf216e1dda304390…

MALICIOUS

PDF

83.8 KB Created: 2021-09-07 05:23:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e8133a2238358fba51c40366c250d30f SHA-1: 9245e91050c6fc877786ec8daf3c6a6f83f34a67 SHA-256: cf216e1dda3043902d59509bc9ac0788ea84b507f73767f90c76e0ebda3cc4ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and ML classifier. It contains numerous embedded URLs that point to various domains, many of which appear to be part of link farms or compromised websites. The presence of these URLs suggests an attempt to redirect users to malicious sites for phishing or malware distribution. No scripts were extracted from this sample, but the overall structure and URL distribution are indicative of a phishing or malware delivery campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=essentials+of+programming+languages+solutions+manual+pdf PDF link annotation
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/55045168316.pdfIn PDF document text
    • http://sylvianapoles.com/clients/e/e6/e63d90d46a840f0b3195f531cec11f6e/File/75876723410.pdfIn PDF document text
    • http://dakhoanhanai.com/images/files/vekix.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/gobetodudukolegiviwar.pdfIn PDF document text
    • http://zhuxintrading.com/uploads/ckfinder/files/20210901/16304838605301.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/58093063337.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c974a3e918---rijarodo.pdfIn PDF document text
    • http://minipit.com/data/files/sifadegimi.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3f4ad8a9a---kisabodoset.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/pedasowuxanomuweladiwi.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/p9o90lset5dcqltpm6grl2dne2/83954865024.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/18480579979.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c246cd708---75645431294.pdfIn PDF document text
    • http://amdind.com/userfiles/file/16963749519.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/d34620a3c8357e2a8aa6a8c13e01bf78/9169821148.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/2de08c13636d22d6324e040651be246d/46276952050.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/70b61464c6361b17134a7289e29ffc27/11871257301.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/f9bd41f9eadfad46da9460795b6aa330/bodinixefuxanodomojepusin.pdfIn PDF document text
    • http://preiswerte-unterkunft-papenburg.de/mediapool/juzar.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/d62359961c262babeefe47146873e2bb/5631592698.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_off0000e258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE258 17764 bytes
SHA-256: 7f7b54d4b52c3502dc664588784fdfb3c9ba66689204eaa573fde52a479a7e69
font_01_sfnt_off00011081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11081 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12898 10924 bytes
SHA-256: 5cd24fabf448a7a08c79c77fecca79afed99960e5ee7c2866a13453d84cba2a3

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