Malicious PDF — malware analysis report

Static analysis result for SHA-256 e696a33c43b51503…

MALICIOUS

PDF

88.0 KB Created: 2021-08-17 23:19:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cc6becd20724be5bcb7c2f234ee00131 SHA-1: 121219fd94a16ceb03bc63726375ac5d72b0320d SHA-256: e696a33c43b515038eb653d8a68b5164c90c6f2e57c9e9ebc63172e510491d7c
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://markone-tools.com/upload/files/tinalabosejitolivof.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd7d35c9591---tedupo.pdf
    • https://partnyor.az/userfiles/file/35324376454.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/2rtasimjm1kej64ovnalq2htnb/rexeso.pdf
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/o804a85h1rhlvknc61728q1h21/roxomal.pdf
    • https://vigiweb.cl/dinamicos/files/file/lefejibej.pdf
    • http://aexpress.lv/index/images/up/file/pozivabitesij.pdf
    • https://alnahamgroup.com/userfiles/file/wodizik.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078309551d78---22914821442.pdf
    • https://turismo-galicia.es/ckfinder/userfiles/files/21643362081.pdf
    • https://cli-kh.com/uploads//files/202108061254279140.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/65ce3b0762ee82be19c4780c7f2195c1/59874728645.pdf
    • http://beijingteye.com/upload/files/kuxevuregipaju.pdf
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/5ff4e96b320579c15fb9f32c126ea8f2/16787407830.pdf
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/98375313584.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742a54cef56---22931502824.pdf
    • https://krzczonowice.pl/gfx/file/15749362633.pdf
    • https://mattress-leader.com/media/tududapenofuvenizar.pdf
    • http://altinay-law.com/images/file/13180029516.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/5044b78022fae41d348d5f3cdd2eae38/92653158685.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160849dbbcec4f---xiwudinemufi.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a20db934e6f---zakewupanesifike.pdf
    • https://luminex.pl/upload/file/35285184991.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+apologize+for+a+short+notice
    • 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_off0000effa.bin
1770e4cd13355672b813ff68d696c60f2415de33c8fadc8063bbdcf1d3bf4428
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFA 18500 bytes
font_01_sfnt_off00012019.bin
6e74f8ff738e8a1a5d630bebca24cabe5b3c8f369657fc8e3776d3308953a119
pdf-font-stream PDF embedded font (sfnt) at offset 0x12019 10896 bytes
font_02_sfnt_off0001395a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1395A 16792 bytes