Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8c4c62e9a4c45db…

MALICIOUS

PDF

86.3 KB Created: 2021-06-25 15:44:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2b74ab91a09a4819bbefdc4aac46422e SHA-1: f4265c3b83a9612e8b0f2283df11e4759cc0aabd SHA-256: c8c4c62e9a4c45db99d61111410e667ca09cd17f8533d0b5ef42b209d15d5f62
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains a link farm pointing to various compromised or disposable hosting sites, suggesting an attempt to redirect users to malicious content. The presence of external URIs and link farm patterns strongly suggests a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c494c09540c---meranabopar.pdf
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/i27grl20e65risq0r6ne21o9ga/nenuxovijugonemibe.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a997551e317---ruxixodijagowebugopoded.pdf
    • http://kstarsmall.net/userfiles/file///pines.pdf
    • https://mokhalasati.com/userfiles/files/pisetimazupiv.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/4s8u9311fg5oei1v6kqi3jt08b/57666236262.pdf
    • http://khanaphatgroup.com/UserFiles/file/pagexegoda.pdf
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d1d6f2641---52359839500.pdf
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/3d6e1bd91c603f9288d7b5c9300c1052/wulisurofovovawekegefo.pdf
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/4uus96kl9u5cr4o25iunmh7t8q/dezakaxom.pdf
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/74938f3a87a5804ef4d54ba908eb5968/nejoxiwoze.pdf
    • http://bbpcosmetics.com/admin/upFiles/2021-6/file/nitelevaxu.pdf
    • http://blessingsngo.in/userfiles/files/46666011095.pdf
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/460b9a80870f9b23c64e383bb7f796d8/83876025506.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=words+in+english+with+h
    • 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_off0000f088.bin
e3fd1fe8f4c15d44f947fd25e73d539a6a3a5cc51f9126b38fd037f69aab5b32		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF088 16712 bytes
font_01_sfnt_off00011bbd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBD 16792 bytes
font_02_sfnt_off000133d4.bin
feffdd9b77cd6d4778c443d4864aa38c5244dd51b898e97708a052961646598a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x133D4 10444 bytes

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