Malicious PDF — malware analysis report

Static analysis result for SHA-256 84e5f49ab9cd4e45…

MALICIOUS

PDF

81.5 KB Created: 2021-06-26 03:22:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a4b0a14a3eee4da91ca22e51438a5aec SHA-1: 8005b2db03844f236f34f55c2556da092773580c SHA-256: 84e5f49ab9cd4e459f579d56a2c7e91d7ab6d5609eea6533f8e5a0e8e299754e
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious content. The document body is unreadable, but the heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://sattamatkapatti.com/userfiles/file/15528807925.pdf
    • http://dzbnf.com/upload/file///zodewomigafikinidu.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801744d19ea---32530987214.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/b426c54006aef21a1f00f6c1f0c0f31e/4585817512.pdf
    • http://awkontrakt.pl/ckfinder/userfiles/files/25439242791.pdf
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/185bec6526c2a2ea047212d682890dbc/naginene.pdf
    • http://solee.cn/ckfinder/userfiles/files/63282356077.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/8sv1hq548ssvuboisf71rvqtk2/30830903722.pdf
    • http://zabradli-znerezu.cz/userfiles/file/77097012770.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/12337d8037c2e4775fed94090b70b1f8/53462522627.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b77d0effe---15457829906.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/vrl4rdu7joqguoafca46qd64i3/xabuzolerura.pdf
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/3465782ec08085d206d4a9dbad56afba/bibuj.pdf
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/41b4a2c70bf875fe4168ff7dba83ec6c/xabedarifapor.pdf
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/7ak2h5bbtil92q1a3u9hp486kv/21818556191.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8b3e86f23---xoxupofoxajim.pdf
    • https://actorconseil.com/files/file/46274380203.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c76bff2dc36---76501697790.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/1a905c560059f6ad561672edbe4c6747/97612993914.pdf
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/bc82d5cd0687399f1887a81effe06085/89404009672.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd03c339b8---poveguzawuwa.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf42333d84---livaju.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=microinch+to+micrometer
    • 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_off0000df55.bin
8b9275f434572cbbbcd0a157656b76e33160a22d1b3f03da8871fc68bde6df87
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF55 10112 bytes
font_01_sfnt_off0000f5ad.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AD 16792 bytes
font_02_sfnt_off00010dbf.bin
2b4dd738dc97aee08c3dcd4d70ab0763bb75d515501ffa2e339c11937b1c6b91
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBF 16788 bytes