Malicious PDF — malware analysis report

Static analysis result for SHA-256 4989904136fa6e16…

MALICIOUS

PDF

67.9 KB Created: 2021-08-24 08:34:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b4162f327be7ffba997768976d862e7a SHA-1: 816052ca8de7987dc1494852367c891b52eea4ac SHA-256: 4989904136fa6e16cb02efd4b2ffc60da53d0b2a1baddde3f8878b7dde9cd1e5
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such PDFs for link farming, likely to direct users to malicious sites for phishing or malware. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5557

Heuristics 5

  • 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
  • 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://smidgel.ru/uplcv?utm_term=nis+to+forint PDF link annotation
    • http://nacnsuaa.com/clients/4/49/49ab1acc6c62b5a39110d621a19f71c0/File/67431019116.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/iq21n5k4moqvptqpqsleogga47/64380045082.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/91382428498.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/08/14/36361764230.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b1200a20aa2---71807932079.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/89781777832.pdfIn PDF document text
    • https://hagepoorter.be/files/files/fudofusanowilatedodoxotej.pdfIn PDF document text
    • https://tecnicamistasnc.it/file/30160903875.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/97949619367.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/ximewukemuzivubegakijor.pdfIn PDF document text
    • http://minlinart.com/archive/upload/files/89070429123.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3718157ba---zarukupositup.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/15789388024.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/40978299875.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/59691776590.pdfIn PDF document text
    • http://cnkls.com/userfiles/file/1624383876.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/gibuviwa.pdfIn PDF document text
    • http://thehonourride.ca/clients/c/c2/c2a221447f3e921143a55eca482c8289/File/13743767316.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/8d7242ca307fadd73fd5b89b7310a0fa/mixamiju.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/95240684708.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/p8sl197vs65aj1uq7if47m1v2p/wakabuno.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607202b8904d6---28119462741.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/67968334774.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD406 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC17 18144 bytes
SHA-256: e945d50071c063c6daf815d612f714d4ae095fb254d06809053fb9f688c0a070

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