Malicious PDF — malware analysis report

Static analysis result for SHA-256 528c682096b32f89…

MALICIOUS

PDF

74.9 KB Created: 2021-09-14 13:52:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3551b775518b0e4842fb9e85f38418ee SHA-1: 59217a63d85d84e5fc75c7b0a8bdaea554e909de SHA-256: 528c682096b32f896966fdc7e82c9b2d6e6cb872ee8d7a4f7e29ea205549feb1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs that point to potentially compromised websites or disposable hosting. The presence of external URIs and link farm heuristics suggests the primary goal is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • 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.
  • 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://wastran.ru/uplcv?utm_term=using+standard+form+to+graph+a+parabola PDF link annotation
    • http://ackerviewguesthouse.com/userfiles/file/79050301105.pdfIn PDF document text
    • https://haidangpc.com/contents/files/39293743011.pdfIn PDF document text
    • http://esipro.be/userfiles/file/pirejofeveresudur.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/zawetuxife.pdfIn PDF document text
    • https://iqrainternationalschool.org/_assets/files/bolonokunebaminulu.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab5e3b7897---mulujet.pdfIn PDF document text
    • https://oreopay58.com/ckfinder/userfiles/files/legozunefok.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf71b742e9---87464472765.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/26117622338.pdfIn PDF document text
    • https://loyd.rs/images/file/nefap.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/kofozejolab.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/3076385758.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/xovasafowujulefomin.pdfIn PDF document text
    • http://mzch.pl/userfiles/file/pupuwumefazixaxevokajap.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/31f938da2259217b6d6f813b28836fd1/feziwopuf.pdfIn PDF document text
    • http://babamoleskine.com/files/file/datoselilaxojuxejewosoxa.pdfIn PDF document text
    • http://veitali.com/upload/files/92279505825.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161333fac22f86---98901604092.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/zojikix.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134bda3bc57a---44356806819.pdfIn PDF document text
    • http://hhoasis.org/app/webroot/img/fck/file/6065058207.pdfIn PDF document text
    • https://www.opsclown.it/ckfinder/userfiles/files/metotanelun.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/palajajatesiwola.pdfIn PDF document text
    • https://istanajp.com/contents/files/wajonezex.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/poreranugubesefuwekaz.pdfIn PDF document text
    • http://gachtrangtritranvinhtin.com/gachtrangtritranvinhtin/Images_upload/files/tebodikarifimawiwamiwu.pdfIn PDF document text
    • 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_off0000c1b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1B0 16828 bytes
SHA-256: 400a805e6f6ff3299201ac4a73383f33b8da9b5ea32c8e26c264e14626d6418d
font_01_sfnt_off0000ed1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1C 10960 bytes
SHA-256: 30b386da21293c452c9d88acaf2b3882e86420d14baa5d95ec2503fd960d8371
font_02_sfnt_off000105d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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