Malicious PDF — malware analysis report

Static analysis result for SHA-256 75e6419d8c28af2a…

MALICIOUS

PDF

81.8 KB Created: 2021-09-02 23:43:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b711ed811e636228d96907693c5ae9d4 SHA-1: a640fc76b4ff5f9fc23072c0d60f576317153a43 SHA-256: 75e6419d8c28af2afa8c812ce33675711aa11a39374a5c1d9ab8ef0b7c071569
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as containing a link farm and potentially malicious content, with a high ML score and ClamAV detection. The numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggest an attempt to redirect users to malicious or phishing sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for direct user reading but rather as a container for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://doktor-okonski.pl/uploadimg/file/11998325512.pdf In PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160921b6f99e82---82740656485.pdfIn PDF document text
    • https://almentispharma.com/ckfinder/userfiles/files/vunoxevakikubij.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f48c97d0c---37013602321.pdfIn PDF document text
    • http://fdscience.com/UPFILE/userfiles/files/13750648269.pdfIn PDF document text
    • https://ficsllc.com/wp-content/plugins/super-forms/uploads/php/files/f7connp9931377h640fa251ooq/83064244295.pdfIn PDF document text
    • http://airsoft1.ro/files/file/63849464231.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1611de8de6d437---saximapu.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/2033658297.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/50a1953608f8e63ee95ac3a273c612c1/movatifidamamigazifexuxu.pdfIn PDF document text
    • http://easyhypermarket.com/userfiles/file/nirimepagesagumufix.pdfIn PDF document text
    • https://brakos.it/file/52721488118.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/p10lkmrrohnmvk28rdogovr9l3/suberi.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/wabimogigixiv.pdfIn PDF document text
    • http://1959blackshirts.com/clients/866684/File/92725207518.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab685607f69---zolixegifafapu.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/26348830365.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/42687191186.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/nigekilokonilafuvaj.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160ce8cdc50f32---76365014976.pdfIn PDF document text
    • http://freetourscadiz.com//ckfinder/userfiles/files/panasur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=convertir+pdf+epub+gratuitPDF 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_off0000d78f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA6 10796 bytes
SHA-256: 10e39b058784b8924894479140be94cd7bd1e4566582c4c2657b2cdb06e82224
font_02_sfnt_off0001083e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083E 19632 bytes
SHA-256: 9e4c19c65d9115eaf23d68c796f2109368bf190168b5920c5b846484ff96ccc1

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