Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfc5d085b2daee4d…

MALICIOUS

PDF

74.2 KB Created: 2021-09-11 06:35:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e1fa7a0380b1d17f05c6fae407a7120f SHA-1: 57e54ff5878a8b5a205828dd096a5a4d5c706350 SHA-256: dfc5d085b2daee4d730accfb0b00d9b93cc8a09e3db68f85f82f0d6ff210d541
176 Risk Score

Malware Insights

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

The PDF document contains multiple heuristics indicating it is a link farm pointing to compromised WordPress upload storage, likely intended to host and distribute malicious files. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the structure and URL patterns are consistent with a phishing or malware distribution lure, potentially leading to a second-stage exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://paklya.su/design/img/upload/file/95701080481.pdf In PDF document text
    • https://webmenuplus.com/images/file/vikuxulakado.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351edc1ac7d---15901563155.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/nuwabuluwijaxibuwibujofu.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/dosedibexol.pdfIn PDF document text
    • http://siblom.ru/files/upload/file/20420999733.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/2888125195.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/lapugikilipeju.pdfIn PDF document text
    • https://mashura.co/userfiles/files/94892626755.pdfIn PDF document text
    • http://gaudi.tw/upload/file/rigoxizefavokamegotugi.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/jaluwubasoserima.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/19520877682.pdfIn PDF document text
    • http://www.sanjuktabanerjee.com/fckimages/file/vusarowunagarixoxo.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/doninudaxevoz.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/wirenejogivezipanujetamox.pdfIn PDF document text
    • http://lycee-elm.com/userfiles/file/18302175831.pdfIn PDF document text
    • https://songhongresort.com/img/files/55196293093.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/38666087701.pdfIn PDF document text
    • http://effekt-film.de/files/file/wabolaz.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/vapaginadipajodafuzavap.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/bcle8vovr9a5hgl2a9sl7nev92/22975419187.pdfIn PDF document text
    • http://www.portaldasfreguesias.com/portugal/vianadocastelo/vianadocastelo/geraz_do_lima_sta_maria/ckeditor/ckfinder/file/luvinisigun.pdfIn PDF document text
    • http://dopuskvsro.ru/UserFiles/xagujuzarunad.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/9112887d9ab99a1ebdbf2565c959949c/nigekex.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/kuretiwiwerevamoruxubemas.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/27915088425.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+change+your+snap+location+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_off0000be16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD628 16724 bytes
SHA-256: 4a8067d8dff9e1b169f5b7aa47bb8409ae8b7a2fc6641c503c638253b89acd27
font_02_sfnt_off0001012f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012F 11084 bytes
SHA-256: dda581bbc2981645024637a5739874dda86472567f506a94ffc41d15517e8de0

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