Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e44d866ff63ae3c…

MALICIOUS

PDF

90.1 KB Created: 2021-07-24 07:12:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 454bd0b7ce071f4391e323fd12eedfc1 SHA-1: f4d458b0e76a591895f231027479a173ce417505 SHA-256: 8e44d866ff63ae3c6c9d025d294fc95243764f183230c0ba782a49d4c0b7bc94
154 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous links pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and a link farm heuristic indicates an attempt to lead the user to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9724

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://aggengr.com/uploads/CMS/file/makonipemarakum.pdf In PDF document text
    • http://utuin.net/files/fckeditor/file/17822198437.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/zunelisikijudekinevututaz.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160dd9e232f8f6---99869822511.pdfIn PDF document text
    • https://www.aeap.com.br/ckfinder/userfiles/files/98357701852.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c922517e906---71141180446.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/91d5d7bdccbac691637e02acb2443cc8/86423621441.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/zuwediwazenetopez.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095ce00996c6---venajanewa.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/66745544564.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/9f3dd1a78fb9601562ed8c341740f665/82744993256.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/vilesab.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/20c98f2cb8ff18c0850003fa9253a1af/tuxaminexuponoru.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/93535710954.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/71b8cee26dd20f1f331b73cfa72d68f3/ravuvoxupiza.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6cda56a4b8---59980864268.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/tovimomabogobibedawikem.pdfIn PDF document text
    • http://altinay-law.com/images/file/joluzufotapolupapuz.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/52800775442.pdfIn PDF document text
    • https://sealskinz.ru/files/file/66009459000.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/tudiwiwaronokaxovek.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607982eecd39a---93839847200.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076f8d583dad---49886111718.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=can+you+transfer+whatsapp+chats+from+android+to+iphone+for+freePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FD 17164 bytes
SHA-256: 43aaf79b938901a82eeffdbc485db3d297e3cf31c6647ccb8d75367c94a5265f
font_01_sfnt_off00012ef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14706 1736 bytes
SHA-256: a970dc50f3fc642965faeb3d6f2817be39c8fee70eb220fb851f6e1b0fd382ad
font_03_sfnt_off00014f4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F4B 11172 bytes
SHA-256: 052796a6201d3f883e68a1ba7ad91b9db170d5b99c7dbbb56642695c7d69686f