Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c3d492717eac357…

MALICIOUS

PDF

106.0 KB Created: 2021-07-01 14:01:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f62873ccef24290c43b6c5d780f42c98 SHA-1: cb7ad91ed3ed08247fac019b2ba806a198ef8c8d SHA-256: 8c3d492717eac357ecc3923e2ce4b74cb882fb008f27681ee945b164d0188cf6
156 Risk Score

Malware Insights

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

This PDF file contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure as a link farm suggests it's designed to lure users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://nomylo.ru/uplcv?utm_term=seven+founders+of+the+servite+order
    • http://anthonyvienna.com/sites/default/files/file/26063127289.pdf
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/2fe0bf089101fb6adb2cfb86fb6c54aa/fakofudozunetubizobinu.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b3098052304---gofutezugedisepatide.pdf
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/80a512355a904890f6a3f182825ac6ae/jazuzejep.pdf
    • http://princeworldwide.com/multimedia/userfiles/file/82784326242.pdf
    • http://tuzvedo.hu/elemek/file/96858540972.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/9fc4badb2ec0246f0067339fd314c032/49965055275.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160dce5e6d9311---bexamudipumeb.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f69fbd874---42040907658.pdf
    • http://alliance-ltd.com/userfiles/dofufora.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/l4v29enu2tkoeqmjfjp2vjj114/befabimisutik.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/ffda6bdca807ff46a6dbbcafb0986a1f/65837985738.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/415569fc155a3f95abf547fe544a84e6/lasunozadirimugutufisolu.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8bff65ad1e---mibilizonelap.pdf
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/940b6fd6472bae327cc57d45c83f0d9a/nizejenulusobomufuzu.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe80d26055---xapegepefo.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/karazuzaxal.pdf
    • https://paperland.bg/uploads/file/deladutejinupuw.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/6107284393793783dfc8008c025284de/jawetopofoka.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606f36a275590---ruloxolil.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794048aa8f5---bididim.pdf
    • http://comp-art.ru/userfiles/file/luginegapop.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_off00013f12.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F12 16792 bytes
font_01_sfnt_off00015724.bin
a3bcecb2ef878a8762375723f1293df010ce41abdd3c0208f2402527fa9fe6f4
pdf-font-stream PDF embedded font (sfnt) at offset 0x15724 17048 bytes
font_02_sfnt_off000182e0.bin
f40685b1fba9d2de63c6a6c6e4c3d187a9c7ac97bd5a0db81ded4183bd8d2bf7
pdf-font-stream PDF embedded font (sfnt) at offset 0x182E0 10484 bytes