Malicious PDF — malware analysis report

Static analysis result for SHA-256 37110d91d67478bd…

MALICIOUS

PDF

84.9 KB Created: 2021-06-26 02:42:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 3a29a6745ad40c4a34a8edc79c9a52c5 SHA-1: dfc61777042504c58125396fd94717f4eddb6e81 SHA-256: 37110d91d67478bdc8ba6c269c9f27a5ade5bc66568965c949fd5075d0ca0d07
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL heuristics and AV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://akita-inu.lv/www/files/files/99222416358.pdf In PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/13129649072.pdfIn PDF document text
    • http://boxethai38.com/upload/file/52129639944.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fe8a9e587---48975366560.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c701cd47dc4---85379451659.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/77373589335.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/dologitevudaduja.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/pavaviw.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ad3f92b6e---gugexumudofuketedak.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/63346970612.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c09ff035c---pisimuwoguvelusopa.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/75034319455.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210603015151.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/1c285c1bca709abe079e00b8e23ee741/jasanid.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609b26721b3d3---zejiva.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/kujagitufa.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/9tcco79thkkk5lnnh6vdk2u6hs/3803794106.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160884e7a16bdf---95423773550.pdfIn PDF document text
    • http://panteres.com/files/files/burofiserupivitil.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c295719f1---52980355028.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16072e64a8df36---28232261082.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d424713a0---jujar.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607126ccab63f---66976957667.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2a3601e6c---17881602759.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/10037789248.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=oald+10th+edition+for+pcPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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_off0000e7d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D3 17468 bytes
SHA-256: 66efe803b8837cef70560ed94bab547f4f1e412c97e43db91330a295da6e5be1
font_01_sfnt_off000115b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B9 10748 bytes
SHA-256: 1cf26813adc5335783862b003bd62730ac8b04492cc33553da4e96bee0b963e5
font_02_sfnt_off00012e53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1