Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0b4df0de2ee8a25…

MALICIOUS

PDF

93.1 KB Created: 2021-07-15 23:24:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c599ea83f354b7641377f94607792911 SHA-1: 3dd850e3ceafd6c0b34f8da80efda778ad647c06 SHA-256: f0b4df0de2ee8a256d0b8a6ca51d853312dc45e4b6d2aac05175561d9dfeab58
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many of which point to compromised CMS upload directories, indicating a link farm designed to host or distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080dd1e13cf1---vowisik.pdf In PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/c50a667a5ebaee2fe9288e11cff6c4bb/95193707997.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607821016fc44---dupugik.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609df9749ee47---komowategemebewopuxego.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/49995110307.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9bcf56241---68897518568.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608e086c75764---xumalivinelodatifugimosuz.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/lvl7bmlpr7cnr7i91flijc39et/28800523535.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f97980a2f2---31355917840.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/jovevofifufez.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/4309092726.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/a7e2cea72e08e4eaa8a9726963cffdb7/rimixekifoku.pdfIn PDF document text
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082484791915---ganolosoxekopoweni.pdfIn PDF document text
    • http://soldresold.com/Shradhdha-Mehra/soldresold/final/ckeditorimage/files/jabenir.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c78d8fa6c---vawizowizop.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/32053095063.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608106f46bfa7---51237696423.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/77523584693.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/58723825224.pdfIn PDF document text
    • http://hrudolf.com/userfiles/36344178594.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/sigiwezewopal.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/1591096396.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/0a5e8220238b3c57db27433aa02f9bfa/jigerotejazapuwifevip.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddb2535834d---lafokobutorininelil.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/padapuxejopupaniruf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=i+just+wanna+love+you+baby+for+the+rest+of+my+lifePDF 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_off0001067f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011e91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E91 17692 bytes
SHA-256: 75f37aad347cc8d23baca03e67994cbc92cdaa81018f39028b23ea432b868a96
font_02_sfnt_off00014d0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D0F 11064 bytes
SHA-256: 67dffcaf203f6edc8c309b6c9925015bcb15bf6afb9f83ff4ef34e302c8803a8