Malicious PDF — malware analysis report

Static analysis result for SHA-256 6738b6c75b4aed54…

MALICIOUS

PDF

81.3 KB Created: 2021-08-19 01:59:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 88df647809aa42b25d216cb735bcaabc SHA-1: 12c6c9d673ab2c307c3e51fe8ed46e059077eb64 SHA-256: 6738b6c75b4aed540d886395736c7f32ebe802265210e2524aa78469e89ecffb
156 Risk Score

Malware Insights

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

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload directories, suggesting it functions as a link farm to distribute further malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is a lure, likely for phishing or to download additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607750b21ae72---88347660809.pdf In PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/a0fedcf408ce3d00615bbaad6aafdfd2/48836864111.pdfIn PDF document text
    • https://okinawa4d.com/contents//files/tekikin.pdfIn PDF document text
    • http://africa-emergence2019.com/userfiles/file/javimepigatofebekuwu.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210728052722901.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/d142901153d2b895026a427df8d6d99d/24025804547.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/6eb33c17b2dfaa5cf8bd6dbdd375f7bb/letikofi.pdfIn PDF document text
    • http://www.seja.lv/assets/ckfinder/core/connector/php/uploads/files/sevugusizifolatiduzof.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/ralalati.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/rd2nhcigmpv7b89r1ce3taak91/razulejiju.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/solajanamizo.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086678ccfc4c---bodat.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/9307fd468b41e29daa5a13a429aae031/ledobalatofafuxerini.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/80523916526.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/lopamejem.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/a7a086e46fb1fbdcb023da2aeaaad5ac/pixitavogupasevilexeruj.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607133856bdc0---89066501135.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/68793031820.pdfIn PDF document text
    • https://rivnerun.club/images/files/1380016314.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f41787dad0---tojukuvuzatodezov.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/6d50cffb618932ba25006b9372393afc/juvepamisepotimafok.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/7542787916.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/46830600897.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=independent+practice+the+pythagorean+theorem+answer+keyPDF 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_off0000dbad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAD 11160 bytes
SHA-256: b7d0ba8591f3eda2b8792df48a79fcf9b686665c9f462521c83faee9a94e8fc6
font_01_sfnt_off0000f56e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D80 16352 bytes
SHA-256: 96ef09068d60ecdec039cd38cb2238a3633bb8d6223637036cabccc1a4a7db2a

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