Malicious PDF — malware analysis report

Static analysis result for SHA-256 88ba7157454986c8…

MALICIOUS

PDF

125.7 KB Created: 2021-08-17 11:11:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 10b2e1b2392e76ca264dc092fad93926 SHA-1: 25af560b873a8467f5a965f83bc7c46c82ea9519 SHA-256: 88ba7157454986c85882e8ba53a44f858946602b148d7df3bbf37b82c7b3a3ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution scheme. The presence of a link farm on disposable hosting and links to compromised CMS upload storage further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://avonsteel.com/UserFiles/file/51340581411.pdf In PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/tq2ceoqpqa85spg6n2jds0c785/96117281824.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/84126241020.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/61095566226.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/a47b182a2ea959019d77fed6c4c729ce/38616434341.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160afa83ae6c17---xilusivoxusog.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/0712fc208ec60faa456e799cccef702d/purevokax.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/dadefolozexe.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/32516624804.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6b43d2156f---sosegorolada.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/n81r1uq3s6hp1mi6p7h1lgrrdv/viroxiregafowagib.pdfIn PDF document text
    • https://xn--mgbaf4adbs1bd2i.net/upload/ckfinder/files/84514520064.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/uj3kqmq9cv4da1nde0j78lkub8/mepodifubupuvalosaki.pdfIn PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/pizosili.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/ramutekajabomuwujabitegi.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/3b5094da8126018a5678959795e9204f/tipudevogumuwutujuxud.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/49688610398.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1dfef640e3fde94535be02e7d9ea91cf/32432683425.pdfIn PDF document text
    • https://chineseclothingonline.com/File/95318573687.pdfIn PDF document text
    • http://goneviaggi.com/themes/userfiles//files/21964842933.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/rumokujan.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/lixijitibixesefikogulozug.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0b8ca0843---12005891269.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=philosophical+foundation+of+education+pdf+in+hindiPDF 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_off0001889c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1889C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001a0ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A0AE 17948 bytes
SHA-256: 60e599fe096d94489b3cf1439f948384a7310cfcc8545130d8f36dd6f8c56117
font_02_sfnt_off0001cf56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CF56 10716 bytes
SHA-256: dff892159b02fc32d927668febbda11f467d9608da1952404ecf383bd5979a0b