Malicious PDF — malware analysis report

Static analysis result for SHA-256 675c31eb0f8ec3d0…

MALICIOUS

PDF

91.4 KB Created: 2021-08-19 19:58:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 86f86ff121db58d5691a1a6c070afcdb SHA-1: 05c6dd5516b0e11b3e40b62cb6160444e05619f9 SHA-256: 675c31eb0f8ec3d0fdfa77f4c9f4142ee0d6dadc1f1ceea6686763d32cbe1748
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

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://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/rovonibukazed.pdf In PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160afc58310bf2---jagevobesabexejogijenewum.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160be7d6fc736c---61356968756.pdfIn PDF document text
    • http://brukbet.com/user_images/file/87764067880.pdfIn PDF document text
    • http://geoman.cz/data/file/widepavotozixami.pdfIn PDF document text
    • http://tfforming.ru/d/files/jurami.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/kibedowovetit.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210508090235.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210625044451364.pdfIn PDF document text
    • http://kondicionery-lobnya.ru/upload_picture/file/46697240878.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/ff68cfcfeae7611ebddcdc9ecb5e5fdf/23614537325.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/bfc632a7a77e8042253c9e53b6577b1d/fedagegatigiganadibot.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/199c57710e54a27dc8aaf620702bf96a/zafosemeji.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/saminuv.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f37621a8ad---41240781343.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a878a57143c---badirawibabesasu.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d702e67698---mezerufudufaduvib.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/degezox.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/15919489589.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/i9bmodm0jccea091j455beomur/guvubuge.pdfIn PDF document text
    • http://namuvaldymas.lt/userfiles/file/97232448703.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/noropopu.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/13928981144.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210719155803.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/86306334654.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/1a4efe30f9a00374a2ea4495de43f30c/25264786208.pdfIn PDF document text
    • http://moawin.org/editorfiles/userfiles/files/tituza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+get+a+minecraft+optifine+cape+for+freePDF 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_off0000fe5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5A 17888 bytes
SHA-256: e4adc96425a2ebfaab2c882d218c14113ed5d70186aaca71bd18719d56cd33ad
font_01_sfnt_off00012d8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D8B 10688 bytes
SHA-256: 742616eed5c288b26c1c97cb1281eba1e3ea58d707921e18a04706f8e719ecc9
font_02_sfnt_off00014611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14611 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1