Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf45299da3e772a5…

MALICIOUS

PDF

87.5 KB Created: 2021-06-29 05:45:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: af13e7b0328e1d441c2a759529d6f6be SHA-1: f55d556bc57be0bac475cafbdd426c722634ff31 SHA-256: bf45299da3e772a57e9f98cd63eaaf6ce88028273dd84523e31999565641fd56
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to potentially harmful websites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f238e3013f---movub.pdf
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/484b3f2c5ae1af7710ca6fd669905e53/55906206837.pdf
    • https://coil.hk/upload/files/72129507941.pdf
    • https://menu2uplus.com/images/file/mejitoxopirogivopap.pdf
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/vh8oo1h0qthh9n6s5500jnnqc7/13397890002.pdf
    • http://www.proyecpapel.es/ckfinder/userfiles/files/8811348762.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/l0s6onjm43uq8p0p7fntmcecr6/63286785514.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6639405c1---sopavuxuxixemiraxeb.pdf
    • https://noithatkuongthinh.com/uploads/files/13612791044.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8bce47b0e---josuxojuxupekamu.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/89862ced9bb9ef36d02cba2d4284e692/62326114379.pdf
    • http://anhuicrew.com/upload_fck/file/2021-6-5/20210605085455305919.pdf
    • http://scuderieverdina.it/scuderia/userfiles/file/31420227979.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608800f2f2e54---kixal.pdf
    • http://funperm.ru/content/file/goselobuzewosomubov.pdf
    • http://faurerom.com/userfiles/file/60934471284.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1724a9ded7---5923821651.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160987bc0c712c---tuborifat.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/33lvrq7mo1eh50fv567ukola80/74844625399.pdf
    • http://aceonlinementors.com/userfiles/file/32227353272.pdf
    • http://bajcsidavidfoto.com/_user/file/dixudumesilofuludapufusal.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/804bba6a00148fdc90bcaa1b02dd7dc9/seruxobazupemebajobimogex.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ce5e0bef8---34497708777.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090eeef59255---fuselasofosurerewigolem.pdf
    • http://hocikto.info/userfiles/file/49682023962.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+to+remove+alpha+security+tag+with+magnet
    • 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_off0000f36a.bin
dd1d51e3dfa8fd9309dbc75bf5c72fa1e9ce18e1fdc30d944116b22137148669
pdf-font-stream PDF embedded font (sfnt) at offset 0xF36A 16536 bytes
font_01_sfnt_off00011e1f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1F 16792 bytes
font_02_sfnt_off00013636.bin
3e039095716cbdb4e82501097bfc9a8eec4ee834457e04c33500b04d9c7da05c
pdf-font-stream PDF embedded font (sfnt) at offset 0x13636 11176 bytes