Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c768114de9c51c6…

MALICIOUS

PDF

87.5 KB Created: 2021-06-27 04:22:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: bc321a19ecf1d763f7d784f7a21ab6b8 SHA-1: b8e9a9db2c9c5300ce5beeeaf3b3909dc8ac3127 SHA-256: 5c768114de9c51c6c5a39b1d482487e6828efdcf9721e4af326d018799e0e1ec
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary attack pattern involves exploiting PDF vulnerabilities to redirect users to external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://biocoils.com/img/file/jusafegixamifiwituwur.pdf In PDF document text
    • http://bmcnx.com/userfiles/file/12640953158.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/df98225709e4fba27909a82d5a49bf2b/viritilapinunegusulagoxaf.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/4454d0783949d7771b769340ab45798d/zatobibexa.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/d95h3fqr9ipj8324t8hvvrtgh3/soruk.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/bd57a1e2a83d6a174f684a97451a132f/15426591138.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/3a58fdf1b00f44dbe61f9d315f4e861f/87035443939.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c7cbe5618---vunutoxalozeweme.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/d6c38b693cd50f4b4420f945a96ff8dc/xutoda.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/94510666857.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/domutato.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/50792287140.pdfIn PDF document text
    • http://whs1963.com/clients/7/75/758a827d59fb1c2827eec60421ffdc22/File/21680127654.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/e79840a11e4ca6317c459a931480c49d/fokirinokoludoloruwe.pdfIn PDF document text
    • https://dm288.rs/slicice/file/9883387547.pdfIn PDF document text
    • http://0851gay.org/userfiles/202106file/2021061420120070554.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a26a0f253a3---fakugobeluzuvorad.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/84856329917.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c7468cff1---lefadigik.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6d9614e67---60626269848.pdfIn PDF document text
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/535e874d6e10a110e9404600a251481c/71199903563.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f19c844a68---xuvazevemitipotebuxirinit.pdfIn PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/gobow.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/id45sd1j332d0e35ku2ldjjj01/31743626245.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/powobulafasuridorosiwo.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6473d236e---83702459724.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=the+journal+newspaperPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f10e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10E 18116 bytes
SHA-256: 8dba03bb8b0958aed2c9d8636c8619a51abe0537a46121f95d93ea228182fed8
font_01_sfnt_off000120f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13910 10436 bytes
SHA-256: e41d01ba802bd47555b3241abf5bcdc355dfbc4665af67f4276345119ad220e7

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