Malicious PDF — malware analysis report

Static analysis result for SHA-256 627d049f79b519b1…

MALICIOUS

PDF

84.2 KB Created: 2021-09-12 16:20:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 538190913165acd4224eac9e2c0117f5 SHA-1: 435734dbc0b7c4abb24a150b9f448fbf9afae4d0 SHA-256: 627d049f79b519b1c4f702866b368aaf0a5ea868f280a6e79e20f8088767ed97
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to numerous external URLs, many of which are hosted on compromised or disposable domains, suggesting an attempt to distribute phishing content or malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://premiercontractinginc.com/files/file/xovebepigopolavixug.pdf In PDF document text
    • https://ataru.site/js/ckfinder/userfiles/files/95718697915.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/dowojez.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/jukawupukapeseremipizegok.pdfIn PDF document text
    • https://encoyun.com/calisma2/files/uploads/mixuruxapuxabodidexuf.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/novuf.pdfIn PDF document text
    • http://home-hj.com/up_photo/file/79723914369.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210904_7B5AE316EA339FF4.pdfIn PDF document text
    • http://cermak-expo.cz/data/files/file/51032479833.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/5441356294.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/90837346108.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/tubovakunizesape.pdfIn PDF document text
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/57306039945.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613c02b6ce126---pesotavobuzusuwenim.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/favisunuba.pdfIn PDF document text
    • http://intertribo.sk/files/96076228909.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/5ee7f1a47ce325ad83ae7dda84c59443/74062900886.pdfIn PDF document text
    • https://khoahoc.timviec365.com/picturesfiles/linulojukogefupugi.pdfIn PDF document text
    • http://dioblina.eu/userfiles/file/finupideligudabuki.pdfIn PDF document text
    • http://kiajihlava.cz/UserFiles/File/zefasijewipuveduj.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/xelezemulasibogap.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/27687895434.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16136b8015c422---nakenijukaxiden.pdfIn PDF document text
    • http://wwstationery.com/files/file/72762374918.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/kegoxekemipu.pdfIn PDF document text
    • https://rails-bg.com/fckeditorfiles/file/71755804473.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=edit+video+iphone+terbaikPDF 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_off0000e2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D5 18820 bytes
SHA-256: 7286f6d583b46de2a8a5d1e0842ea89f1f1ba0c49a4a5982a480c164bdecaba2
font_01_sfnt_off00011375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11375 10556 bytes
SHA-256: 76ad86a09c0380cc860cce2e5766a7cbc3e75e4127bd6f926112e4a7e177f0cb
font_02_sfnt_off00012b33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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