Malicious PDF — malware analysis report

Static analysis result for SHA-256 c778df00bcff7416…

MALICIOUS

PDF

87.4 KB Created: 2021-08-16 00:32:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 558c307312059df5073cec70cc7bb344 SHA-1: 94e3ed1c76ed3c122e028a86cadd0cbe32d2b9ec SHA-256: c778df00bcff74161fe461d8385f2206ef1b7d005bf0757ef412306075346410
154 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites. These links likely serve as lures for phishing attacks or to distribute further malware. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8422

Heuristics 5

  • 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
  • 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://laborke.ru/uplcv?utm_term=what+are+the+regions+in+ghana+and+their+capitals PDF link annotation
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a717b60168---86432985451.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b24a1222f9c---45261313201.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/94572671193.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f1aa9256100---54459451900.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d8e98ff9e---sadufidolageve.pdfIn PDF document text
    • https://eitmedu.in/ckfinder/userfiles/files/polajujuvibibo.pdfIn PDF document text
    • http://taihegas.com/filespath/files/20210804014730.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/ca2f3ba1bf0f647116523e22ad56d5c3/makugopil.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/53298514597.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/f07fa7f468bafab13fe6e69ee799cc5a/lelumigus.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/bijosamulodanovojovinilu.pdfIn PDF document text
    • http://webursitet.org/Files/file/fodupasifaxev.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a88f480cded---suvuzawarowujej.pdfIn PDF document text
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/4a7785b64ce35ebe7c5b194f0789c1a9/51617794426.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/10616643323.pdfIn PDF document text
    • https://warungmimpishio.com/contents//files/fuwabikudigamebopanotenon.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609331baa5e20---16628361898.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160920a1c13930---xeliwogirogolexobipa.pdfIn PDF document text
    • https://istanajpdua.com/contents//files/gerisadonixegud.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ac00e292d---88018962005.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/46285149239.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffae55809f---ziluzexavi.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/8d0730d31b26ef088709d32e355ca85a/dikefefizifajufuniri.pdfIn PDF document text
    • http://gulfb2b.com/userfiles/file/24717753801.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098741f104f9---sojede.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_off000126ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013f04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F04 10784 bytes
SHA-256: 00883ff4bacd84db0979b396dca85ed6107086f02cd4d96bddf211c6efaec3ef