Malicious PDF — malware analysis report

Static analysis result for SHA-256 a94b85cf5644a7d2…

MALICIOUS

PDF

81.8 KB Created: 2021-09-07 23:04:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 77d55658ae44e44c75c81e8a5bf3b475 SHA-1: 4233d6286319f7c1f882629d05d3ea7f63a495b4 SHA-256: a94b85cf5644a7d2cde90b1df85fadf89503cb9802ac8d4d1c42512b55bf9ce7
126 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan. It contains numerous links pointing to compromised websites, indicating a phishing or malware distribution attempt. The PDF structure suggests it's a link farm designed to redirect users to potentially malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4612

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 http://mebco.ru/images/file/91216876913.pdf
    • http://hf1968.com/clients/48820/File/mavejizarufajubowalaxin.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609c447588c52---supujaziko.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/754a0cccd81f44ab73b504dd5420ffa3/10879718199.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86a6bf3178---taxax.pdf
    • https://global-brand.net/userfiles/files/68675453348.pdf
    • https://santchavarabed.in/ckfinder/userfiles/files/goxisu.pdf
    • http://focostrade.com/files/20210624161202.pdf
    • https://dancleland.com/img/upload/file/47210548027.pdf
    • http://t-p-fortune.com/userfiles/file/maraloraxidetobexuwe.pdf
    • http://tafgambiatours.com/userfiles/file/vajijasetuzobo.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160835547b351a---gilupapixom.pdf
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa3ee98bbd---lekuvezebufokikotuxatukix.pdf
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/73458215696.pdf
    • http://cn-biyoute.com/d/files/8719857507.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161144e30408cf---10415184004.pdf
    • http://fapannimario.it/userfiles/files/saxinusexiwajitakejeferos.pdf
    • http://kes.org/upload/editor/files/valewonixarafiradoze.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160815ee6391d3---jakolazofoje.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/381b46a06ab1f6c4b4912df718ab0645/rirugavetafeladu.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc47a370c8---memifapaxuvowemasizikalon.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/uche72micggi6arsr793kr7sdm/28067313746.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1d548c0e4---71932266896.pdf
    • https://dbjadow.pl/attachments/file/degotetelumekip.pdf
    • https://prcomponents.com/ckfinder/userfiles/files/37207667396.pdf
    • http://biurod9.pl/public/userfiles/file/70417123194.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a924276e013---29212821126.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=quantitative+aptitude+questions+pdf+free+download
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e633.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE633 16792 bytes
font_01_sfnt_off0000fe4a.bin
2a585ea93f41733c079cbc0f42f20beaded2b408706829634f98f738cef38add
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4A 10948 bytes
font_02_sfnt_off000117bb.bin
0877447214ea0745970807e14bb363745d66074aa9084102b3c059aa24c5cd65
pdf-font-stream PDF embedded font (sfnt) at offset 0x117BB 17608 bytes