Malicious PDF — malware analysis report

Static analysis result for SHA-256 42d8c6f6f1aaeecf…

MALICIOUS

PDF

74.7 KB Created: 2021-09-18 02:07:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 77a5a33da80f8d2f2e76eeab2a0fad51 SHA-1: 133d799b0e0e6e0cfc5048fba27091582f3d4f4e SHA-256: 42d8c6f6f1aaeecfa90c89731689f85af0bab7c21f3afcb77a0b43326acc421a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, containing numerous URLs that point to potentially compromised websites or disposable hosting, likely to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics suggest an attempt to lure users to external sites, possibly for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/db4fa238c5ac81f8ec06946d41adc045/89118563816.pdf In PDF document text
    • http://nhasachthunam.com/upload/files/fewefopabaja.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/wobirizikinonukerisis.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210911160751.pdfIn PDF document text
    • http://mycoapaisyl.com/webimages/files/fubizidil.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313c9f263b4---22372790143.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/48882432428.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/16121166179.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/av8n8089c3pecsn08qgaa9p7bj/bokuje.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/xugumisekisuwadev.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/limuxitafilowam.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe70add4d9---17895069710.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/jejufipube.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/85347599767.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/nujuvasanizurixaxunuxo.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/654560345.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/minuzexinuvopagelitetewu.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/3342220759.pdfIn PDF document text
    • http://thietbibepnhahang.net/media/files/16367133388.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16137beab60b84---wadibo.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/50756352712.pdfIn PDF document text
    • http://wgadget.com/file_media/file_image/file/nemepejijasiz.pdfIn PDF document text
    • http://momsystem.ru/public/file/jatudozak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=clash+of+clans+town+hall+14+mod+apk+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_off0000c084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC084 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89B 10900 bytes
SHA-256: e5204cba388c440b4be86b89067677b8ad15eb7471ad9ca70b903d97269c1fc5
font_02_sfnt_off0000f1d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D5 16708 bytes
SHA-256: 4b5c002e58730693cb4c1b5dfdc43306250387f6fd931cb6c421002d162f17f0

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