Malicious PDF — malware analysis report

Static analysis result for SHA-256 608fe52219ca9424…

MALICIOUS

PDF

90.1 KB Created: 2021-06-29 00:05:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f4a9932cb2ad588c43e0024a1d295085 SHA-1: 97419f5cf218449fb95e46d9f3513836ab712eaf SHA-256: 608fe52219ca9424fbdaa8c6656c41568e1c6ecd5bbc9a372927b230d179de8e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, many pointing to compromised WordPress sites, suggesting it functions as a link farm or redirector. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a tactic to distribute malicious content or phish users through SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://inwebjor.ru/uplcv?utm_term=christmas+toy+trains+electric
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093094e00598---43295315598.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0dc8a4419---wajawinegu.pdf
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e2b86ccfb---32278731545.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f111f17e4---gopudoz.pdf
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608e75a40150d---69566183140.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9b1acaaaf---29732725771.pdf
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/l5l3mtrpgd164bidiums678m0r/95299274600.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/81lvd8vt8ke0scs0k5r413v0np/9534801632.pdf
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/e2916d76cc1f94663833fcee8030ad7e/xejibowix.pdf
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/83260ad203a020c9daaece19a87309c2/piropi.pdf
    • https://techson-cctv.com/upload/file/14362986000.pdf
    • http://xn--h49avwqct32ewe967crscpsaz7d.com/ckupload/files/58846712024.pdf
    • http://symbioticlifetech.org/attfile/fckimg/file///20210509104936_969996332.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b73058ef5c9---toweketefebi.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b75cd9053---77460530567.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/rtd9h5bb8pirdf06tos257b7ti/refiluregumujige.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16076689dcc101---burebivubivuta.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d814a16c2e6---30264842911.pdf
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/romeruw.pdf
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/motosugemonulijonabineno.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160874c5821539---tenodap.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/359763da6f42ba772ac8e1e2937d97ea/92513774583.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc13.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC13 16792 bytes
font_01_sfnt_off00011425.bin
bfbb5a39b27031732dbae22adafcd593c5df2f480c63214b6e10c8d93ee8784c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11425 17968 bytes
font_02_sfnt_off00014360.bin
1da2a8dd21dbf68a20d1bef877c4896ac176fe39895992aa137175a2fa7ae0f0
pdf-font-stream PDF embedded font (sfnt) at offset 0x14360 10640 bytes