Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba77ed260e34b774…

MALICIOUS

PDF

85.1 KB Created: 2021-09-07 18:33:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9751c4ada7dd5132cf30ab6f43c5a6a6 SHA-1: bfa7e96da8f7fd8fad9fd3aff49ccd66638156e7 SHA-256: ba77ed260e34b7744da71babfeb64a320e36447d056b12926d4b58cd7b16d091
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The embedded URLs and link farm heuristics confirm the primary function of this document is to redirect users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://soudurelauziere.com/upload/editor/file/febilokarumazigum.pdf
    • http://newdimension.su/userfiles/file/nosemokavetesikokokem.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/819e1faf96245038233d1f7d7b8b660b/zuvavorokefewarazirileta.pdf
    • http://talani.nl/userfiles/image/file/54378249183.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a360b3ce8e3---24131723045.pdf
    • http://alompar.hu/uploads/content_files/files/17275063775.pdf
    • http://mezon.jp/userfiles/file/vipapubemukugitafofoxaf.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795c5793fab---25862957807.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f720fa0478---64816182208.pdf
    • https://nabsangram.com/userfiles/file/tekusefiloruv.pdf
    • http://agriturismolescuderie.eu/userfiles/files/waviwile.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714eb7023bb---gadubetunajululudo.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/7098e8b1e0dbf4c48bcc4e195c110ca0/5167361948.pdf
    • http://dlzj.net/upload/files/20210728000214462973.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ab66f2c4485---zedalejowegeke.pdf
    • http://joyearland.com/ckfinder/userfiles/files/nupikoworirezuwu.pdf
    • https://exporoaster.com/app/webroot/files/images/pages/files/92914597799.pdf
    • http://humboldthighclassof79.com/clients/1/19/19f040aad945c40a0acbd79abd3dc6cb/File/71092660168.pdf
    • http://dichvuwebsites.com/media/ftp/file/gulekugebasisibokiwelat.pdf
    • http://muabannhagiare.net/images/uploads/files/42745406756.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/75d119f6dc7f7e4c5c18063f4d5d9e26/57388482623.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858ad282f0e---43876784314.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=magic+chef+wine+cooler+user+manual
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7a0.bin
23057d9e68cd37aaa7e307e2a4114317ed354abb57b16924d637ed0e2184b6fb
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A0 17980 bytes
font_01_sfnt_off00011641.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11641 16792 bytes
font_02_sfnt_off00012e58.bin
2f763d47e81b83eab47b7d845aa0939ed95e90bf573d08904a91a827ed8f863e
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E58 10864 bytes