Malicious PDF — malware analysis report

Static analysis result for SHA-256 570e37703f2cc68f…

MALICIOUS

PDF

82.0 KB Created: 2021-09-04 07:59:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8ddf78450499ea765dd57c0489ba4df1 SHA-1: 5f9469e9c2f7fd929abdd0ec392930f183256ca0 SHA-256: 570e37703f2cc68f3099c04a942eac41294f877d32792352effa8adac796af02
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous external URIs and links pointing to compromised or disposable hosting, suggesting an attempt to lure users to malicious sites. The presence of a visual download button further supports a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://tele-video.ru/upload/files/28862162463.pdf In PDF document text
    • https://dodatkireklamowe.pl/web/uploads/files/56753935810.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/gapexizopike.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/1410f890b58e171d03aa51af917d8659/94890577232.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/11154690113.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/54708108273.pdfIn PDF document text
    • http://ccshecea.org/upload/files/34455936934.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a16e65b5300---60478292074.pdfIn PDF document text
    • http://falerisztika.hu/tmp/87927875699.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/jigitiraw.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/21904327095.pdfIn PDF document text
    • https://elesud.it/img_pagine/file/ramavazesojowokuwiz.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/36810796379.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/fekumoxesukutiwobemuwa.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/namawozobadadures.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/3920419578.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160adb8077cde5---53049070521.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/zijad.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/49624009817.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/jifuwimaduwatirujoz.pdfIn PDF document text
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/xogudenijelojazejaximefil.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/35623941189.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160826a38a502d---14058793023.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=civil+engineering+project+management+pdf+downloadPDF 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_off0000db4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4C 11108 bytes
SHA-256: 43a6a06c8cd6bf31e8a51b05f798cb82623a7974de4319027664a63978d07c0e
font_01_sfnt_off0000f503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF503 17236 bytes
SHA-256: caf0d7ba458786ddd03482f955f8f6392e84cb51ea5a72056b72a41ec74a2763
font_02_sfnt_off000121f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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