Malicious PDF — malware analysis report

Static analysis result for SHA-256 cae2fc374d0f4bba…

MALICIOUS

PDF

86.6 KB Created: 2021-08-31 16:36:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cdfd5dba2076ab696411ef5f91cec922 SHA-1: 73d7a94564bfea4b4a88eab9368d8e0546fa9f14 SHA-256: cae2fc374d0f4bba5ab45d29696113da89de7224e714101ed86f8ca49c82942a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress sites, a common tactic for distributing malicious files. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to decrypt a downloaded archive, a method used to bypass gateway scanning. ClamAV also detected this file as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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
  • 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://nexusmediation.nl/files/foxevijox.pdf In PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/ukicb8s917qtvk2nfr3vh8egg2/3219455244.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/b37cfaab8f13a7cdf1d1d3a4afd584ce/97164017429.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16080b6766868a---kotixotitis.pdfIn PDF document text
    • http://euro-ex.com/images/blog//file/17026678942.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/rixonu.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1428ce9e6---56350680496.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/82476282160.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/zojuzevewavudifosimiromo.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/gojeberasatitemepis.pdfIn PDF document text
    • https://idroilektriki.gr/files/file/kiputetusivu.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/sijelelekujike.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/wodozoxorewo.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/6gbgi5ba9am3d5mar3a1rfe9o2/74557493005.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/pinusatupiko.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/ff2a31c4dddd1abfe12b89abac55bfb6/potuguvo.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608feb8b2838e---koxovema.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3dc684974---68643618793.pdfIn PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/1374258089.pdfIn PDF document text
    • http://myboydfamily.com/clients/7/7f/7f513a2250c12de81a70a6735749c289/File/32509793.pdfIn PDF document text
    • http://cuahuyhoang.com/media/ftp/file/63297087139.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/56842883309.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5fb7cc9aa---fekowesoxekugoguvod.pdfIn PDF document text
    • http://kelvista.lt/images/files/watami.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/1qot1g7tqpipe8lthp44pvav24/59934070810.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160e27693b9b65---18327699596.pdfIn PDF document text
    • https://tangentemag.com/img/file/96516053318.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/57169062017.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=ppsspp+gold+games+download+for+android+gta+5PDF 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_off0000eae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE5 17856 bytes
SHA-256: 3cd532f0de9005337023c4eb765312471c745e590381c0691b6a6c647fcab0ff
font_01_sfnt_off000119a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A6 11060 bytes
SHA-256: b515bf2f5641d0ddebb9caa022438f9ae0081abcc45889440a8e382c3a9a8fe4
font_02_sfnt_off00013347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13347 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1