Malicious PDF — malware analysis report

Static analysis result for SHA-256 008f56b9a2baca95…

MALICIOUS

PDF

80.6 KB Created: 2021-09-23 00:59:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b6818ce2cc3170485281262866db72d9 SHA-1: e4b7e7da08fbc1facc67ba1d5508450049258d30 SHA-256: 008f56b9a2baca95c725ed9e5e96fa7509789261503ad8ad2a0c8598aa51f64f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The primary function appears to be redirecting users through a network of sites, potentially to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://hiredriver.com/uploads/assets/files/vodisom.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614796adde7e6---96860459936.pdf
    • https://georeno.ca/userfiles/files/19757829129.pdf
    • https://techson-cctv.com/upload/file/kademibafulaget.pdf
    • http://z-sinpro.com/upload/files/voxomomopukil.pdf
    • http://marcelponjee.nl/ponjeefiles/file/xuvigopiwibavufulivisedel.pdf
    • http://maudchristan.nl/ckfinder/userfiles/files/rixunifufofajafuzax.pdf
    • http://oryginalnedekoracje.pl/userfiles/file/80987432912.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148b609786af---botefok.pdf
    • http://richmore.kr/uploadfile/fckeditor/file/68889108684.pdf
    • http://holland-ex.com/images/blog/file/rofowizozoxo.pdf
    • https://coonvalleycc.com/userfiles/file/74546756604.pdf
    • http://hejia-ele.net/upload/vakipesufag.pdf
    • https://tarsiman.ee/files/file/57584804582.pdf
    • https://ltssinternational.com/res/wysiwyg/file/tibowojugunirururupa.pdf
    • http://studiosantese.eu/userfiles/files/51595599622.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c33ea68af---30201769810.pdf
    • http://aptwash.com/userData/ebizro_board/file/zezurizidezewadodumuxuxiw.pdf
    • https://vietrocknet.org/app/webroot/img/files/71402975429.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfff1ea449---78687701404.pdf
    • https://langumeistras.lt/i/File/76040809475.pdf
    • http://nensi.si/upload/file/59979940784.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=i+love+us+watch+online+free
    • 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_off0000d804.bin
65e63371fd17610eab8de0f95dcc152adffe8d8a6ab96f6fcd2f598d94043d26		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD804 17440 bytes
font_01_sfnt_off000104d5.bin
25badd8d8bd8e076b6ec37ea536ea762bd503964a6674654e75b6264cdcd91c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104D5 10636 bytes
font_02_sfnt_off00011d37.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D37 16792 bytes

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