Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2a4de715923f7e3…

MALICIOUS

PDF

95.9 KB Created: 2021-09-11 01:31:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: d33ceb70c6312fbc88440b34ef98280a SHA-1: 1c3c981deec78c7eaa3207ac7f44ef7ca49e5508 SHA-256: c2a4de715923f7e341b6f898150ed8cd7bad192185d81a365d315455240d3711
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it's part of a phishing campaign, specifically using a lure related to password protection for archives and MFA harvesting. The embedded URLs, including one pointing to a compromised WordPress upload, suggest an attempt to host or link to malicious payloads. The ML classifier strongly flagged this PDF as malicious, and ClamAV also detected it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://sapientgenerator.ru/files/userfiles/files/27960011611.pdf In PDF document text
    • http://yushendesign.com/images_fck/file/1631307916.pdfIn PDF document text
    • https://refakatci.net/userfiles/file/vedezamep.pdfIn PDF document text
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/71015271381.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/24100586172.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/lizofaruduz.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/ritirogikolobijagetifuge.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/kagex.pdfIn PDF document text
    • http://immopolignano.lu/images/lofejizasafozutibe.pdfIn PDF document text
    • https://coffotea.com/uploads/files/202109071527142741.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/74303863336.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/92437002069.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1b6a7eebd---vojasavopibi.pdfIn PDF document text
    • http://kangshi-you.com/uploads/files/202109050949565629.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/kq19co0084pce3a905iiicqsm0/52025362325.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/41382571160.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021090603041816.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/xipumuxatevuvolewafivuro.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/faxanobidupo.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210903_142000.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161342706a1229---67726989293.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=please+enter+privacy+protection+password+to+unlock+androidPDF 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_off00010e1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12631 19112 bytes
SHA-256: 092f2c92efc90a58ed342e4641f77a5b0f0faac4eb0a0d546c659e480cf5ebcc
font_02_sfnt_off000157c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157C9 10968 bytes
SHA-256: b620df1365ddb061ab6ee933469fe9d08e6ff0601cfefd845537ac93116325c4

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