Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a45f8c2697d9f8a…

MALICIOUS

PDF

75.3 KB Created: 2021-08-30 20:25:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bacfd438da097a1527bc4b7bcee71a38 SHA-1: 501f13f97a263cfe2382bd51a4464db8881fb999 SHA-256: 7a45f8c2697d9f8a9b80419e5b2303ab860f2a7df3d285234427ad6e9ebb4e65
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://majorpropertygroup.com/userfiles/files/pepapegun.pdf In PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/80430884001.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/85186006348.pdfIn PDF document text
    • https://digireg.se/upload/xuzuf.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095428d7e873---jirem.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/53599654928.pdfIn PDF document text
    • http://ukkies.be/userfiles/file/73219897022.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/3216513312.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/93313670021.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/mafoluzinamezajases.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/20933546577.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/77061963702.pdfIn PDF document text
    • http://hobbstownis100.com/clients/6/66/66141d04a4341350d76ae3a38785cb5a/File/80215576526.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/26268868482.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/kozoritafovurokofuboj.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/97219625698.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a819fad77c1---96205504718.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/4a83bfe8d4d947f4bfe8929d11782bfc/36135528296.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/taliginib.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/3ac984163dea5b05e89c3e44e346d5cd/81280093889.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b47dedcd275---wakuwabibufowitanivo.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/64919aceb9713f131da2a9782832f5a3/35063282894.pdfIn PDF document text
    • http://chicohigh1987.com/clients/47015/File/wiwumesadenewabisewune.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2cd7c14d0---96755211278.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/nujowama.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606cca5281dc4---78318205205.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=select+all+clips+in+premiere+proPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5F5 15692 bytes
SHA-256: e08691dd97c4799abb35d7f7bec3ea61bed33f6999c25965c8150d4888c1bec0
font_01_sfnt_off0000edd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD1 10608 bytes
SHA-256: 44efcf7429c424bbbc44442be7fc5dc1a10aef957e75ff46cf633801f40aa3b5
font_02_sfnt_off00010601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10601 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1