Malicious PDF — malware analysis report

Static analysis result for SHA-256 b20d3eb8111f3324…

MALICIOUS

PDF

85.6 KB Created: 2021-09-19 23:18:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e96bcb1603eb06e9d8a262f70e4c961e SHA-1: 33dc08afe591eb89c4704dfc968befe372012131 SHA-256: b20d3eb8111f33241045d679f0b3836d8c9f18be8d07f85906e4321af0df7519
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites 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 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zensushidanapoint.com/uploads/files/dagugutaforojotoba.pdf In PDF document text
    • http://reckdance.pl/userfiles/file/poxofanaluz.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/revajutiruxabatesidaxaru.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/tigupalewenurogit.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/wexedorowidibawew.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/12659633200.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138deab09dfe---zepozotup.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/kaxubiveborus.pdfIn PDF document text
    • http://huynhgiabaohotel.com/uploads/FCK/file/pijewanuvesesuliriwozike.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/8r9dho9kkegj70apavq0l49g00/44909330927.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/ac6dd1a2eecbd0b5b62ccaa062b21dc6/75407804011.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/ronutapix.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/satatakurisu.pdfIn PDF document text
    • https://casadko.fr/userfiles/file/sewaxuvuwof.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/jaaukpedbh2tvlr1fvk8j3latj/rofobe.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/34250283114.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/1524570195.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/36431520568.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/161305bdef02cf---39735890474.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/89348109909.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/vogajigedubalazow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+see+private+instagram+accounts+2020PDF 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_off0000e284.bin
62591d935e05c569758335ad45dbf44960b1afac6c7585e10ff73a10b598a343
pdf-font-stream PDF embedded font (sfnt) at offset 0xE284 20564 bytes
font_01_sfnt_off00011675.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11675 16792 bytes
font_02_sfnt_off00012e8c.bin
8f561ac3604fc45310567b3b8bd719bd829c831b45eb9995ccef4151241da20b
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E8C 11156 bytes