Malicious PDF — malware analysis report

Static analysis result for SHA-256 a240c0f707106b1e…

MALICIOUS

PDF

86.8 KB Created: 2021-07-10 06:50:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3500b0c4144f41432c40fdd623d991db SHA-1: 52775b6f37ce6206ff880fe8f5a810cb8f94e5f0 SHA-256: a240c0f707106b1e908d9e6413639e1fe0fd06ac6b069e0600ad59df4c8fc81b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or phishing lure. ClamAV detection and ML classification strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to potentially malicious content.

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://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9f0630e83---rozavabin.pdf
    • http://e-kva.ru/admin/ckfinder/userfiles/files/86501377066.pdf
    • https://guruamardaspublicschool.com/userfiles/files/wazunigumufasagotovifeg.pdf
    • http://abogarestudio.com/userfiles/file/zadamivive.pdf
    • http://alliance-vietnam.com/upload/files/28763705253.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ddbf2c167---dejetunogezapox.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087fa2254ad8---xumosub.pdf
    • https://moto-trend.cz/public/files/fck/file/10418155828.pdf
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/r8dd254io8f3m859mrrsqo0pje/97073525525.pdf
    • http://varadimasszazs.hu/uploads/files/27381235331.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c4218d91b3a---6253162121.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16072aa29e98d1---12771991823.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/014da78ff86d6a1e2727516148272d16/47197971282.pdf
    • https://malashealthcare.com/userfiles/files/47117116272.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/ffcf757f80ecbd9fc1c55d2fd22b1ff6/18102866902.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090c5f06e916---18784966488.pdf
    • https://keluargamimpi2.com/contents//files/21341966841.pdf
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c429a97deea---56281188395.pdf
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0ad6d2659---17532365422.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d15c51d63---46466484123.pdf
    • http://wardwrightself.com/clients/863644/File/15214746230.pdf
    • https://himalmanpower.com/ckfinder/userfiles/files/12223522249.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16097a7a4c3a9e---44783236549.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca9c3c5827---79107910382.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=building+materials+construction+and+planning+pdf
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/8e64de9fce2cb8eeb4ba2067d125e8ec/xunojerisufazadugiwiv.pdf
    • 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_off0000ef70.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF70 16792 bytes
font_01_sfnt_off00010787.bin
ebe92487efbd36220e101702ed35817140f33cf4db3a3823b99b488c6df1f11b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10787 11116 bytes
font_02_sfnt_off0001213b.bin
b749890551672bc94f483171cc16ed7da1bff2798346f4315db2356e17e8de81
pdf-font-stream PDF embedded font (sfnt) at offset 0x1213B 17124 bytes