Malicious PDF — malware analysis report

Static analysis result for SHA-256 b78befe99a6b4e44…

MALICIOUS

PDF

82.1 KB Created: 2021-06-19 01:43:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e2c703b8672b8e8e954e1a42706df50b SHA-1: 7fa7dd746b42c709fcaac7c306a33d9055d051bb SHA-256: b78befe99a6b4e441104cd791c42049eba42faaba73d4546ca48ed4deaa585ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a phishing or scam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to 'chemistry project topics class 12'. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://wastran.ru/uplcv?utm_term=chemistry+project+topics+class+12
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160787f48aa448---10459405558.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606f68e075729---65021670906.pdf
    • http://transinfosoft.com/userfiles/file/52591814676.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/rqelktgq59lo36amt2rs7mnko7/ripakefuwasitivosaw.pdf
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/upd4hnpq0sradevvdnbqgjce55/55356292503.pdf
    • https://hanul-muresenilor.com/wp-content/plugins/super-forms/uploads/php/files/rp969eilbaiqdopdi4r45s4ehj/53587770992.pdf
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/39c86fabb10aa70da9c7ce94408eb334/99893529010.pdf
    • http://bmhs1963.com/clients/7/72/7286fd37811b7a5dece6e69924e4d5ab/File/tubisibomewifavapamivo.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a539ef606a0---gugatesadasinuk.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/m5d2q7eq32dtt3botn4usmbi90/17911557889.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608afc8629b92---xerupororebalo.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b03900b071c---napor.pdf
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/ra5upnii1sgol9dlnau9l3i5fb/60500789600.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • 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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f345.bin
06e6359d21849109d765ef715d30bcb631e2246b2039c9ad7910c9e48229fbe5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF345 5240 bytes
font_01_sfnt_off0001052b.bin
4734172c7ec7dac4deccecf893197f4ec031550af8ce3525482e2c2025101df7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1052B 12156 bytes
font_02_sfnt_off00012d57.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D57 4324 bytes

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