Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a90c46222df289b…

MALICIOUS

PDF

77.6 KB Created: 2021-09-04 08:32:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6a26d80b94492e55c20bbf72492cc732 SHA-1: 17afa4d80094ae95aba7c1feaab4900a01f5cbb7 SHA-256: 3a90c46222df289baf6b7c5f62d098c744eb1896c38eb42cf1bf752bd560cfc2
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating it is likely a phishing or malware delivery vehicle. It contains numerous URLs, many pointing to compromised CMS uploads or disposable hosting, forming a link farm. The presence of embedded JavaScript, though not fully analyzed, suggests potential for exploitation or further payload delivery. The primary attack pattern involves luring users through a malicious document to these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5219

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://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16294032572373.pdf In PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160736537ce00d---58379590285.pdfIn PDF document text
    • http://anpo.vn/upload/files/84969839287.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/0hbi79129hln5qri7sunjlefqf/22057017885.pdfIn PDF document text
    • http://masonhn.com/d/files/ditilote.pdfIn PDF document text
    • http://freetds.net/userfiles/file/jodevabatetabu.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/fimuvupexizonebi.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/kitesef.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/40e66c21764960065f789c5b4661eb61/sizujopimadodezukodu.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16087b5ef63460---91514390412.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f263fd1c2c---59132281979.pdfIn PDF document text
    • https://actorconseil.com/files/file/lalefupeneza.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/tupam.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b411780a9---fuvoviviju.pdfIn PDF document text
    • http://myshopekerala.com/userfiles/file/38447719813.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc64cdd150---10887881605.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/5f0c4f6f7e3a98a7fbae1bd8d48c7a99/biwififu.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/03283bffb01bf2c0e231d63b67e3a057/xomujadudopur.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/solovigojagisujuv.pdfIn PDF document text
    • http://www.astmalek.cz/obrazky/file/besuvakate.pdfIn PDF document text
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/40c30a35ef5813e7b3c6988b08b4f069/91899849775.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/jefufaxogojagu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854520887c9---kivuviwizimebop.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/21496518268.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/ijtn3ibhjbotaptapqgo806dp9/6204322646.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/78589009060.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=heaven+is+so+real+choo+thomas+pdf+downloadPDF link annotation
    • 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_off0000d1e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E1 11028 bytes
SHA-256: 27feb881b9913d55556f45f1cf4c386dd057fc81b8fb60a05f26a98fb4373445
font_01_sfnt_off0000eb56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10368 18220 bytes
SHA-256: f2075671dda4d3f9c0536a1af65c3d117f95337290cfedf409fbb88ed91deac3

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