Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dab6b92cdb8ae56…

MALICIOUS

PDF

82.0 KB Created: 2021-09-19 08:49:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 300b61496cdafd1fba9c12f7c2ce09b3 SHA-1: cb13feb57a5ec71d6588e3c5fea8c88f22be115e SHA-256: 8dab6b92cdb8ae567be0f92ce79d7cd2268b1bdfca2e1d1109f5a256469b9715
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 https://queure.ru/uplcv?utm_term=set+video+as+wallpaper+android PDF link annotation
    • http://sovaimm.it/userfiles/files/filotifowoguk.pdfIn PDF document text
    • http://temple.mo/userfiles/file/55301333490.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/98023342590.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/75416161992.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021091820100472.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/14135144555.pdfIn PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/bafinovomi.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/12449467326.pdfIn PDF document text
    • http://rezidencianestor.sk/app/webroot/files/ckeditor/files/8611677580.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be6111e254---46225951930.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/zatipabumumexolojowopiteb.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613867b5160d6---dagovalitod.pdfIn PDF document text
    • https://photopoligrafic.ru/ckfinder/userfiles/files/2069216372.pdfIn PDF document text
    • https://vetregistr.com/ckfinder/userfiles/files/terusulid.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/10589122077cb11424755b6c03ee1b4e/64900108090.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614069d172e28---79247735889.pdfIn PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/45813206087.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/16740410761.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/70244445503.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/15019756864.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/18291962766.pdfIn PDF document text
    • https://vnjhanoi.com/upload/files/61890160614.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/379d320f7eaa08be388cbd9f9a864e41/fuponipiwifapememepesum.pdfIn PDF document text
    • http://autofactory-jin.com/js/upload/files/68451794203.pdfIn PDF document text
    • https://bold-iot.com/uploads/files/202109071320094038.pdfIn PDF document text
    • http://agedwedfjtj.pretty-match.com/upload/files/dufikipekurus.pdfIn PDF document text
    • http://jsjxh.org/filespath/files/20210919042630.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_off0000dcd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EE 10612 bytes
SHA-256: d9b1a3be1825565d8954bcde8da3e77a3a9beb5fb3dd8aa2936803af34d710d3
font_02_sfnt_off00010d55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D55 17428 bytes
SHA-256: aa2e969a769b6d26f23f88c277c56babdb33f622abeb4194f67923ef603b4b40

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