Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e2b511484e07c81…

MALICIOUS

PDF

72.2 KB Created: 2021-06-15 19:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21fb0deb05abd31a382bf8f0f55507ed SHA-1: 0b90a04a9c0e72a22f5282441f5c059cf26376bd SHA-256: 4e2b511484e07c815ff167be6d8c4cd93737e0f8a2487091463d1f3333c39cba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links to external websites, many hosted on compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to differential equations, likely to trick users into clicking the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9594

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://drafthe.ru/uplcv?utm_term=non+exact+differential+equation+questions+and+answers+pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071a6c85d8d5---raperaxokokap.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/990f879ec5a75c54d636efb7121b2159/62702198283.pdf
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/dnf94mkkm3tocadl421r939lon/62662622851.pdf
    • http://allycatering.com/userfiles/jewaxapavewobizabovosukoj.pdf
    • https://terminal.hr/userfiles/file/ziporifixawisijosun.pdf
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a710dca224d---wowofakizelufibo.pdf
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/cg8namhapfl45aveopnjdvt345/nopidorajexalebekoju.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607edf464676c---fupemulijed.pdf
    • http://russkiivopros.com/images/FCKeditor/file/35725213476.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/48c1c3c7799b4160a4d11963b514bfaf/36698652142.pdf
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/8becce8157bb63b54bdc027b6f1507a0/fotifewepukevewew.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/35736a9bcf389229759d1337fc15a7d4/dekejigewirozafewawor.pdf
    • https://matskaren.se/anvandarbilder/203/files/bepojazekewigewin.pdf
    • http://ayhancevik.com/images_upload/files/mopajinufogud.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e426.bin
51e921d8d4748821e3e9dbf1278ffc8dabd638ef40982114384667ebd50e07c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE426 5404 bytes
font_01_sfnt_off0000f6b5.bin
aa5b20a5fb2bef0b68dd1fbb6ce6c2d652c64794965d229796b727fdec3b0c34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B5 11728 bytes

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