Malicious PDF — malware analysis report

Static analysis result for SHA-256 6681eaebbe9ba8ff…

MALICIOUS

PDF

84.4 KB Created: 2021-06-26 21:35:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fd1c59f09fe196acd5af53fb3f281f30 SHA-1: 8fffc8b7d33cc2b2f0e0ca11296b34a016af5130 SHA-256: 6681eaebbe9ba8ff0149ba9f3124d1857c061d7122d9cc69ebd4b0c9c7d49ef5
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous external URIs, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary function appears to be directing users to potentially malicious content hosted on compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://elcampoeco.org/FCKeditor/file/5781007802.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1483288af---sokijatuzusojovadimoz.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16083e07e7e2ec---toziwapoze.pdf
    • http://sam-global.info/files/file/gobawisiv.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bff6bf7871a---sisemepugokaroza.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160851c0ae0a89---wewumoxovakafu.pdf
    • http://proreferee.ru/uploads/ckfinder/files/88354997161.pdf
    • http://archerelectricsupply.com/userfiles/file/nofurezowujobovox.pdf
    • http://accronline.com/userfiles/file/pilixajemimudezedamamo.pdf
    • http://aimic.com/userfiles/file/30105729281.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608671d4e7205---80029240548.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a072a8e96c---tapadobixawimusuxapu.pdf
    • http://princeworldwide.com/multimedia/userfiles/file/newoxikuzimogoruzakupid.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c5103d6be36---defurijeb.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/c2tm9tc114cudu17f9h0srti4m/tazumukexinuwulivulusosip.pdf
    • http://www.anclupnapoli.it/userfiles/file/1337472363.pdf
    • http://aylincinarli.com/fckfiles/file/16255495529.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095cef7958c4---53564673855.pdf
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/abdebb3b4fb8cc1aab4e27797a14ee32/96904983216.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160702ea73f2b2---keromejuzog.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b03dbc8c96---zadinetidoxobowewu.pdf
    • http://sushi-belovo.ru/files/15146524231.pdf
    • https://cakenepal.com/userfiles/file/24668849155.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=profile+pic+of+a+girl
    • 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_off0000ea1e.bin
9c703580ad1fdb309a59a46f944d8a33d44ff34e20bd7b77f5e3af423ed6d38d
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1E 10284 bytes
font_01_sfnt_off00010158.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10158 16792 bytes
font_02_sfnt_off0001196a.bin
8ae67c33d56a94b5e7072d0c8870028904f40e45b0dedbb5289d6152454e50e7
pdf-font-stream PDF embedded font (sfnt) at offset 0x1196A 16324 bytes