Malicious PDF — malware analysis report

Static analysis result for SHA-256 587bc4b5c61fcf6e…

MALICIOUS

PDF

84.5 KB Created: 2021-07-15 16:46:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 94ef21ad85c51d5a3fbfaaebe5d7166e SHA-1: 7fa1fea64e01446a02c82f6c9da7904f982fbdde SHA-256: 587bc4b5c61fcf6e78064d440b5dd4bade67b1005b559a6f2c5695cceb91904c
156 Risk Score

Malware Insights

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

The PDF document was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The embedded URLs suggest an attempt to direct users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://sutphinsgermanshepherds.com/clients/21958/File/35905951587.pdf
    • http://jameshamiltondds.com/clients/6/6c/6cc67b5d90347a591bf4e9c0b97a5143/File/fasimokidobiviliwu.pdf
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/3038463639.pdf
    • http://okfilm.kr/userData/board/file/lenamutazusumetasov.pdf
    • http://aapltd.net/userfiles/file/kapirakesutetatudogi.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c25591bd1fa---pidanutonetoduta.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c047c122274---33375603272.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087bf299cad4---fumomajedew.pdf
    • https://zoorichi.com/temp/fckeditor/file/lakozilide.pdf
    • http://svsteinfurth.de/radsportfiles/file/57700823624.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773653b4980---58551024851.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a5332c6ff---76868776734.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc0937b07f---nokapefalijetokoderenez.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/d02f765751593e894cbb2381d81465d3/43843505188.pdf
    • https://fid-data.fr/app/webroot/uploaderfiles/25775343394.pdf
    • http://fouladsazanco.com/Upload/file/77140638582.pdf
    • https://hogies.com/includes/template/uploads/file/55584560623.pdf
    • http://hitecds.com/userfiles/file/97107599982.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f6201c70f---gagulimuzakominil.pdf
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/9c54af12a0291bfa3815d8daa2347fcd/nexurilugulogagibulesed.pdf
    • https://asthasupermarket.com/userfiles/file/73775439523.pdf
    • https://rcot.org/userfiles/file/19836749333.pdf
    • https://caribemed.com/userfiles/file/taxamaturevepazud.pdf
    • http://greece-ex.com/images/blog//file/satumirovarefokafogap.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=why+is+there+water+leaking+in+my+refrigerator
    • 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_off0000e683.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE683 16792 bytes
font_01_sfnt_off0000fe95.bin
018cde6777f119f431d8839d76eed7d865b0a5896fdcd0d0b04ff8b92e9c4247
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE95 17108 bytes
font_02_sfnt_off00012b40.bin
93478c277a1d0fab3a46ef20e5a7f0ad16b887a7bbb89aa743c9cbbdad5f6922
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B40 10944 bytes