Malicious PDF — malware analysis report

Static analysis result for SHA-256 77db9798df34d498…

MALICIOUS

PDF

83.0 KB Created: 2021-07-03 03:03:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 44db155507fb488a063cad85e02c17c9 SHA-1: 53f65f6fd3dd48a44e92f3dc7d5bdd226c77de0f SHA-256: 77db9798df34d498183dfa33c87ffc1df97da2c2e048ab6e97fd12772a749c6d
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. Multiple URLs extracted from the document point to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to external sites. The presence of numerous links and the nature of the hosting indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://cihangirhotel.com/upload/ckfinder/files/34493734170.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a2bd1312a---mujigu.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/f62bdc3ed7f8808367df1dab11d2b1d3/32969516260.pdf
    • http://vincitydata.com/uploads/ckfinder/files/20217061570.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160956b22e6792---wutowo.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/031399eee448b72783a24226f160f85f/jebonuj.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079e99381b4d---viperadefigube.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086221e59121---21170516272.pdf
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/2733ccd534e6060eb524618c910a0214/xezanibab.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3082f73b9e---4991331594.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607936e66c8de---sopopatorifideb.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/5beae270fbf401c7a498e85d53e2bd5b/28877837668.pdf
    • http://bsbcarpet.com/userfiles/file/50595809296.pdf
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/1f5a4c155dea89c52b86dd29ac6a6596/21978347496.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/dfa3a29a824e3a0cfe24ab9a272be517/vatibarabepuvadedid.pdf
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/ec563bc247a8fd1a67ea5fd1c4c9ad46/37012885605.pdf
    • http://feynburg-uhren.de/uploads/79712870642.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff58eab113---21770985966.pdf
    • http://kingtonkatsu.com/uploads/files/sitajorit.pdf
    • https://eseninternational.com/uploads/files/44167706172.pdf
    • http://ahoba85.com/clients/2/26/26d353b61ac95a99d7df5001a3d58300/File/22844592561.pdf
    • http://aj-logistics.com/stock/userfiles/file/latoru.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607c03f8dcab1---wadefuj.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=out+of+pocket+maximum
    • 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_off0000e1b8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B8 16792 bytes
font_01_sfnt_off0000f9ca.bin
b9adf79664f563cd80225b16d38f5da376e76a91503ab09ad85682f6a937b85b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CA 16792 bytes
font_02_sfnt_off0001255e.bin
311dc95d84b84de95ca0f4f611ab21b17fb697a99ddf3cb9c52e8b8de44823e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1255E 10540 bytes