Malicious PDF — malware analysis report

Static analysis result for SHA-256 787008792509cba5…

MALICIOUS

PDF

70.5 KB Created: 2021-06-25 16:35:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1de537b14afb022a1caf90818d6ec960 SHA-1: ee5cc657f654e33f9cd815d6a7731d174b0fe124 SHA-256: 787008792509cba53e3769bc09f6bae7180d36c58ac2a7b8029e3f24e5d7d9d6
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to other PDFs hosted on compromised CMS upload directories. This suggests a phishing or malware distribution campaign where the initial PDF serves as a lure to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/5396c28644b2df26de71edf5a4c02284/74444019618.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd024cb444---46507374353.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086e3bbe879b---12274326957.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16082346b9359e---485503770.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160af73ea1e13f---14244549149.pdf
    • http://drukarnia-warszawa.pl/pliki/file/89351467087.pdf
    • https://kopari.hu/files/file/vifosurogisilibupakirux.pdf
    • http://garantc.ru/userfiles/file/7689595642.pdf
    • http://emeraldoutback.com/clients/f/f6/f61299a274fa8fdb0c00f5b1ed511d42/File/97521170159.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/cqj43m5cckae6f8f1inu5odln2/vigomifinikozivukedibiz.pdf
    • http://budaikepkeret.hu/uploads/file/80269299549.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/85920e92c12b9444b31bb34e4fa63768/45542572552.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079fff2033fb---35627195462.pdf
    • https://detectiveoffice.net/userfiles/file/44215899637.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=accounting+1+study+guide
    • 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_off0000b479.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB479 16792 bytes
font_01_sfnt_off0000cc90.bin
eb71f45e8c2112bb8ccedfef446a25e886f9ecb51e1a8fa69237fa1c6bc3ee3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC90 10484 bytes
font_02_sfnt_off0000e471.bin
eba24272c6d0a4bced28e4da3357bffa285340e4c1bcd94dc0e3d377410d481e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE471 16256 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.