Malicious PDF — malware analysis report

Static analysis result for SHA-256 511d4c779d28b83f…

MALICIOUS

PDF

76.1 KB Created: 2021-07-28 12:09:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 735704430930bcb16b3a9a73ef184e55 SHA-1: c20c71de36cf4e404439a8b5815876aa014223e9 SHA-256: 511d4c779d28b83f520dbd4a814f7331e301b865d8dbd8e7ae1a63a2d2d20f58
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to further malicious content or exploits, suggesting an initial access vector via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071508c8d8dc---17865583698.pdf In PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075cfd2d0a56---74690334576.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/besurozavagapogaladafalu.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/5114ae0cf8ba468f95c4a847c4d8773c/busegakofonovidubabubo.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/65005517178.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/bovanitaraxiva.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/pomuvikabevaxemok.pdfIn PDF document text
    • https://ayurvedaemart.com/uploads/file/66789406438.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3627e2d332---resekujisinalukobifepu.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210713_045929.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/6734055521.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/97209059858.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/3cupk7gp47qm8r6mjc14k7svnj/revom.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/50700954212.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/36869890254.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/90047832171.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1ea466d3fb---pixawipanolev.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/61286052725.pdfIn PDF document text
    • http://edu-tur.ru/userfiles/file/gumexapemumavarim.pdfIn PDF document text
    • https://bibliothequeanglaise.org/upload/files/89068178219.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/282c1a30b9d928cd3efa4e47c5ea9e2d/43540067389.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160716a2144905---nodokememudijowokefuxu.pdfIn PDF document text
    • https://t2sc.me/userfiles/pivufi.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b61a1a9b857---lobenemesozumi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=identifying+triangles+worksheet+answersPDF 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_off0000c6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F0 10876 bytes
SHA-256: eec9daf3b401e84ff94d24b076d375144a4f7694e46b23495de9ed0a8c1c010a
font_01_sfnt_off0000dfdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDD 16552 bytes
SHA-256: 5772b74ee10d11a4c0176e190f8a28d5c2a431e8aedba61dc9b0f88c87041623
font_02_sfnt_off00010ac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.