Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfdedb97a33d9277…

MALICIOUS

PDF

87.9 KB Created: 2021-06-28 22:50:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 36ee376042cc5ea3f4028bcf727956a2 SHA-1: aeb195849e8c555cde42bc43b22776ea9508c5de SHA-256: bfdedb97a33d92774334918b8d8da548976d0a517a219cca204386bad2726721
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many pointing to compromised WordPress sites utilizing the Formcraft or Super Forms plugins for file uploads. This structure is indicative of a link farm designed to distribute malicious content or phish users. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609846a78df22---pedoruwexojobim.pdf In PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0cda518fab---jubibuwufafefegonoj.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/19012f92bb8f5fec9472413bea262f55/96972003279.pdfIn PDF document text
    • http://benrassam.com/uploads/files/45991922737.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/9k1hgl8tmbd4p3jim62midp0am/lonorulukesedena.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/idtj7la9bcekt1b78ephp3iur0/kasujukunajiwo.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/betesanudujomunesunamu.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f307a60da1---pesabevibapazekujipak.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/e1b5caeb905338dd4d75bba207ca5812/22947366216.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a738e10e6ca---72357787411.pdfIn PDF document text
    • https://palet-school.com/files/files/13337922398.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/vifenewemutaz.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/37de2c9f104d6f44d3cb52343d633089/vibiwubovawodefapo.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c935ccab019---86518786987.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/pozasoj.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3a29128c0---pefuxi.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b267dd1f386---wakore.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607473206b485---67254509381.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/xedabebuxirik.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b4bb2e14457---rajesulejo.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160786ac25b514---2223408681.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/40711071965.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/40772412293.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d191fbb93a---funakaliwa.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/vumusov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=luffy+and+robin+fanfictionPDF 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_off0000f3a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A3 19356 bytes
SHA-256: a49a2528dd5f0507dbbda8d68ba1feec726b939a8b9661e92c937c387f883e88
font_01_sfnt_off00012296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12296 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013aad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AAD 10432 bytes
SHA-256: c42504fd3c157c1504dd50813f6f0b447160cf7ec8a57e0eeb75c90dd8357167