Malicious PDF — malware analysis report

Static analysis result for SHA-256 7eb289a3fbb2eb21…

MALICIOUS

PDF

84.6 KB Created: 2021-09-18 15:00:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 799e523bd87ea4a53a15829857e88bba SHA-1: 17255303aafae2a02270525c77fc47ea1945215a SHA-256: 7eb289a3fbb2eb21c5f6c95a2743a9502ad73b5e77da94e4d77bd5b135d75c3c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple URLs, some hosted on compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure designed to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://chcial.ru/uplcv?utm_term=crusader+of+light+apk PDF link annotation
    • https://redac.ch/upload/41495169963.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210904_233253.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/refoxes.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/19917068296.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/e761ba43885e27e665a27550bf86a234/zezotalaxuwogexobab.pdfIn PDF document text
    • http://maychaybocaocap.com/app/webroot/uploads/files/35598470957.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614579e1b11da---69561901316.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/siwejaninizipome.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/34467841726.pdfIn PDF document text
    • https://ecpa.fr/uploaded/file/86630522624.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/f12e333de8ff8e49b735c995c7c012c8/66941115204.pdfIn PDF document text
    • http://purel-biopharm.com/upload/files/83718163265.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/37125987932.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/71119748163.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/93483520198.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/pemafe.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/voxogomadalutejaxame.pdfIn PDF document text
    • https://lecourbe.dk/userfiles/file/52926497838.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/jemakagiw.pdfIn PDF document text
    • http://slstudio.it/userfiles/files/21999227730.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/nivevenuz.pdfIn PDF document text
    • http://devveb.net/userfiles/file/918773687.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/bemogurepaf.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/japorajinezebevajesidiw.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/pm04duo7fjahd3jshdts7k8daj/20805413579.pdfIn PDF document text
    • http://jszl-rolls.com/filespath/files/20210901202956.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_off0000db61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB61 22020 bytes
SHA-256: 8780c3d955fd647b95196161b96f95aec8aa0665d7360a3339d461f63edc300e
font_01_sfnt_off00011371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11371 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B88 10896 bytes
SHA-256: 26f299d575432b5e5a8b7c24d58404e5d1f093719ae6fc0d5613a51477327d13

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