Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad7329ad7bd0c7d7…

MALICIOUS

PDF

95.3 KB Created: 2021-07-26 06:09:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4dcbc96e2b16d796af9ac8144e540711 SHA-1: f2aa8fd36673a4e90660ade92a6db1cd1b7ca15c SHA-256: ad7329ad7bd0c7d7a8342c54059d36a1b6bbc7ca368d08bfaf5e4a2d1fb0442a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's part of a link farm designed to distribute malicious content or lead users to phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9855

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://kiemtoanhaiphong.vn/upload/files/36346780989.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160903b14c3e9a---fidozevadodopokugexexino.pdf
    • http://huiking.cn/uploads/file/142216378454.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16080f4f281705---betifesigis.pdf
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/egdodc59q7hmm9rii7u5f9acq1/64240707987.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/vhi15drm4rs2tjdgb6cefbglnk/kowaxat.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/sccmj5mhio2atg1b53kulhnd1s/33293740494.pdf
    • https://bmat.mn/uploads/ckfinder/files/nevonupewafeveg.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16070ce36e5291---54936892651.pdf
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/028b9b4095e0040e76afff1981565503/tawasuvawamebo.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e1b9a99b8---28969386272.pdf
    • http://mdbim.pl/ubezpiecz/obrazy/file/17850561587.pdf
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/ja3lsvh967mg9311nsc2g317n7/19183053135.pdf
    • http://balcimimarlik.com/resimler/files/jirovegesukebe.pdf
    • https://paron-rebondir.com/uploads/files/60828077946.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d4b2dea053a---26100518509.pdf
    • http://pantryscan.com/123cars/imagefck/file/86860368501.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a86f4dcab2---59957756673.pdf
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcdda18f99---85692197581.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080020c4e56f---sawaxeruwogiwozoliz.pdf
    • https://clifestyle.net/uploades/userfiles/file/81655837379.pdf
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/16064801861.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/0601bf1e5dc15d5f2e09eab331636175/51862123999.pdf
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/6isr7huqqrol67s8cfh47r4996/wogupigagidazem.pdf
    • https://digireg.nu/upload/83331174930.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b27ddb77fac---sumutebeleriw.pdf
    • http://zoncmswebsitebeheer.nl/files/editor/file/medodede.pdf
    • https://ochronaskory.pl/pliki_user/File/48287661957.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+make+apple+pie+moonshine+spice+mix
    • 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_off00010f29.bin
a100c92fcfb06f96b56296ba1b103ad15d32fa1386bd729b412e52e4faa57808		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F29 17460 bytes
font_01_sfnt_off00013ccc.bin
a54e313941f6440a63301eee14c39d6ff44f3e64a1f5433a5981bf3ee499dd50		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13CCC 10812 bytes
font_02_sfnt_off00015592.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15592 16792 bytes

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