Malicious PDF — malware analysis report

Static analysis result for SHA-256 999019aeb18902b3…

MALICIOUS

PDF

85.4 KB Created: 2021-06-29 01:10:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5aacb36d02d384e1ba5583ebf141b92a SHA-1: 7dd76036b2894b3802afc16e38209d5b225cd63f SHA-256: 999019aeb18902b3fa1ee0ca32f41b0ef1ed788a8df46d7a85cfb3a40629cf1c
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and raw IP addresses, suggesting it functions as a link farm to distribute phishing content or further malware. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 https://archism.ru/uplcv?utm_term=gumball+wasted+secret
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce663c3477---56557795952.pdf
    • http://moto-bike.pl/userfiles/file/26176844791.pdf
    • http://technoculture.cz/admin/upload/file/pipojesidazezote.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/v1df5aq1nv6drufnb0rr0047mm/45641134998.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608169d333e26---56999963247.pdf
    • https://twr1115.net/files/fckeditor/file/47812810483.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/2f6c3d4afc34213649ca486ae2be62c1/88232780086.pdf
    • http://naturallabs.de/userfiles/file/30576832688.pdf
    • https://schlosshotel-murten.ch/userfiles/files/kepanunuronubegegipa.pdf
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/nf387n59n43k0tc0bg8ko4k421/komugovon.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608fdbaa9b3fa---11039604543.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/a1fd13cc6a507459ef7676c78d2a8232/diwokubenutuzinir.pdf
    • https://aradovan.com/userfiles/file/mexodinikibolugabin.pdf
    • https://areicon.com/images/file/29185067294.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/eef20fcd3c5e99d0628c58d63943204c/72098117482.pdf
    • http://banghenails.com/upload/file/53606456017.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160873b7a9a6dc---figutuxazirefelosijofadu.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/60444246192397902c7ab81d99f6fe92/58896105215.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838098805b2---54383793035.pdf
    • https://crownprolaw.cn/userfiles/Proj_Name//files/vedufibokurekozibu.pdf
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/c2021dbc5bb43b7d3aae2c07dc88fdd5/99862725315.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/b7lgih8e3b60gji5qav4uh9ik7/36772956877.pdf
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/84789986558.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160981d1b2ef54---porawifowibawamefomaga.pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfc7.bin
885b9024a80bd539ee88f4c17c1e1fa3cc6dab475ff5b740ebf17c73a317c9ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC7 17112 bytes
font_01_sfnt_off0000e8ae.bin
7bd316e93ff29174dc6c08e11669e16392bdbc87835b418a5cdc2d80be5bd173		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AE 10580 bytes
font_02_sfnt_off000100f6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100F6 16792 bytes
font_03_sfnt_off00011908.bin
022a9b60028d233be2a647e02da5839f60f0a9ab4cb775aaeb2e5313bccff60f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11908 17644 bytes

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