Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f8714d4b21eb1b4…

MALICIOUS

PDF

82.3 KB Created: 2021-09-09 03:45:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bbd3c38eec46878eb90819c393f3b061 SHA-1: 0ce02abf84393d5ec5ee8f45f804cf4949f785dc SHA-256: 1f8714d4b21eb1b4bd7eaf52d0a6b431b0959fcd3ca86f3707bf25c969f6313b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://thecargonepal.com/userfiles/file/43399355152.pdf
    • http://kamnitikamini.si/upload/files/82194809115.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/34bf40e509a550ea793f2f0d317f79a9/migafokesiwujizomalufik.pdf
    • https://123natura.com/stockages/files/56668569459.pdf
    • http://sudeoksa.org/userfiles/file/20210903072117.pdf
    • https://adasms.fr/userfiles/file/tiwojajegonir.pdf
    • http://denda.co.kr/ckfinder/userfiles/files/36241524480.pdf
    • http://splogservice.ru/content/files/nunamirudewimovipilobev.pdf
    • http://zhengfutz.com/v15/Upload/file/202198046224931.pdf
    • http://sake-tori.com/images/library/File/fiwuzepigev.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/jiwivotoxakizag.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/dbf44d235e2d0669562cfd9e31d77dfb/zedib.pdf
    • http://61kidsclub.com/userfiles/file/76601615311.pdf
    • http://comlark.ru/userfiles/files/41954357071.pdf
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/matikigujugitano.pdf
    • http://munsusa.org/userfiles/file/20210905121520.pdf
    • http://bjerkelunden.org/content/files/userfiles/file///woxunusinigov.pdf
    • http://lamekatus.ee/uploads/ckeditor/files/folifikamu.pdf
    • http://orikon.net/Images_upload/files/18776513135.pdf
    • http://nicenpos.com/userData/board/file/17600504412.pdf
    • http://bjavc.com/filespath/files/20210909063447.pdf
    • http://harmonie-avion.fr/actualite/files/67777365685.pdf
    • http://orthocarecentroortopedico.it/userfiles/files/bovoj.pdf
    • https://dpengineerindia.com/admin/userfiles/file/69089486947.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=remove+snapchat+filter+app
    • 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_off0000dd07.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD07 16792 bytes
font_01_sfnt_off0000f51e.bin
014318e7ee61108f589a8f7daecbbc91e9575a8d37bed01702282494c51c9cc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF51E 10856 bytes
font_02_sfnt_off00010dff.bin
1dfb9da947c6aa1e0da89fa07544b8d264dc6203228e62d51bc47449d108b593		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFF 18052 bytes

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