Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f82cd8dbbfb2f15…

MALICIOUS

PDF

86.9 KB Created: 2021-07-27 10:28:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d661d53eb722cd4095664fecb200d4a2 SHA-1: d474af8213bfcb2d04add2470bcf816228cb02da SHA-256: 7f82cd8dbbfb2f1509460aae824c5722bd36ad3cac9efb411c00c7c1165f8161
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and embedded URLs align with techniques used to host malicious files on seemingly legitimate but compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1606f29a411dd2---41392182082.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/abadece1862e54f320bf5e6574bbe2a0/lubanizimuninutuliluke.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/1191dca06db78b9b04dd3dde52257aa7/femarowovabenarip.pdf
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5d0822f7d---waxenukipuditivediraf.pdf
    • http://comp-art.ru/userfiles/file/zujin.pdf
    • http://apsara.ru/userfiles/file/nuzajed.pdf
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/c0d85c3bf8f70c56c9d8e1c3035a4e59/xizifutibe.pdf
    • http://intertexmedical.com/userfiles/files/zobilowuxiwoxaduzow.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/9m8c17gkgitf4jo75cuojecglk/68287638383.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7e00930cd---nagul.pdf
    • http://apexnepaltravel.com/userfiles/file/15033593759.pdf
    • http://china-engine.net/ckfinder/userfiles/files/93310873479.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a0393b9ec8a---jegaperorowedaxikobemije.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608101fad6968---rutakax.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cc1b1aaeca5---58881497578.pdf
    • http://sushigonewildtogo.com/uploads/files/zegodabetegitevo.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/d687a063ab7fed226d49ad22401a7246/98614713576.pdf
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/60e85729c74cfff0f900211a267d98ec/24223283866.pdf
    • https://shuswapladystriders.ca/userfiles/file/zuketoburetikewubunusa.pdf
    • https://vegas-shop.net/uploads/files/26443402138.pdf
    • http://zavalinka.by/var/upload/file/62775814320.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7d58eb88a---rimumuzefexojomufowelolar.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160814834b26f7---56455477000.pdf
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/pfgc21uvva8enjirdh5vl8mqnn/sujaxefemejegafapok.pdf
    • https://sardavetri.it/userfiles/file/kinevakuwitusa.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+repair+a+whirlpool+refrigerator
    • 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_off0000f133.bin
9ae1a4d7de2177a23a57c87ba19c645c26a88381e78d39a953d40e9628bf864c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF133 10440 bytes
font_01_sfnt_off00010902.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10902 16792 bytes
font_02_sfnt_off00012114.bin
3afb6cf4544a9c3e8a9fcf1f9a18c4bfeeb2ab11d0b78b4d8146a20a9bc52ed4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12114 16880 bytes

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