Malicious PDF — malware analysis report

Static analysis result for SHA-256 08c583af40ebca62…

MALICIOUS

PDF

87.4 KB Created: 2021-09-07 09:47:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7b6a67d5a69f39907aa979d0ce6ba4aa SHA-1: 855b0edd936458e385f52484f7fa7b35bb2faa6d SHA-256: 08c583af40ebca62dd5762cbf3c658eaf0c4c854a957c846f45a0f6a95a4ad57
124 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and exhibits characteristics of a link farm, with numerous embedded URLs pointing to various domains. Several heuristics indicate that these links are directed towards compromised CMS upload storage and disposable hosting, suggesting an intent to lure users to potentially malicious sites. The PDF itself does not contain readable content, but the structure and URL analysis strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3165

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 http://dnepropress.net/files/file/95771493766.pdf In PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/953abc483f0b5f599f84bd399548a224/93720786167.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/7366487377.pdfIn PDF document text
    • https://makeswebsites.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/binuwu.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/243420e96787c9fe60c1c9d1254a45d2/82342838297.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/marikakevu.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/moekki64saoupajasc0bh4u9b0/82143073128.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/f955c03987ee23cb8881c5d58d9060b3/mebisigoruxerupilax.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/8nvq1hst1gvqlsmt4b55u2bjra/20903427039.pdfIn PDF document text
    • http://teresachild.com/upload/files/59333811798.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/abd70bb15508411f466262b1b854410a/98918683291.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1b3078c3e---nidizikoneputebasure.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087ab75871bc---gazonenufojoxosulazademef.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607019e11f107---26559752603.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/b4f950002cd816bfe35ec0f020692b6b/54602134707.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/23e7697e8d929fe3266d5ba112d815e8/zegenibukujarisuvutegozo.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/tukezufebibuwasujeve.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/4e4a4a41f59f3bf5079afca26c12a4cb/8528424583.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/71904056296.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/384380436.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/fabufupopa.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908b337f127---zariku.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/zajasufudos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=r+milewski+podstawy+ekonomii+pdfPDF link annotation
    • 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_off00010c3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3B 10896 bytes
SHA-256: 4a4935fa6e80fdc2b52701111739febaa2cf67ec27c24b640dc94728efb021f8
font_01_sfnt_off0001257e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1257E 18676 bytes
SHA-256: 5cfb0e4d08f0000065ddb637bcebe810be167a78dd298579d54c96cabdef336e