Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dec0e6dc003a8b2…

MALICIOUS

PDF

71.4 KB Created: 2021-09-20 22:18:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e200d97a6b980b7d7b370bcb001ec152 SHA-1: 8381a68bc93b488938a077d938c3e864beb57918 SHA-256: 1dec0e6dc003a8b2d5f955a76c558c40dbdec41cd43acc0df5788874369d6ea2
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded URIs strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://chcial.ru/uplcv?utm_term=free+download+odin+android+slp+free+v PDF link annotation
    • http://biznesfishki.ru/files/userfiles/files/lajedoviramimujapomim.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161480001a315b---pawev.pdfIn PDF document text
    • https://hoanghaie.com/Images_upload/files/11029478830.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/1bd044a7e7633ec6594995581a6eec5c/wasexa.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/wewugekitijebu.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/luwaxenegiwegadawadiw.pdfIn PDF document text
    • https://birotex.rs/images/files/nuwenuwexuja.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/cc6a2cf3d482b584196cd5bfe41f6ea7/7915204287.pdfIn PDF document text
    • https://zahrek.com/userfiles/file/11605478190.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/51127323340.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/pizowonopazapidonejujegi.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/mikazovuzugixofikino.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/89724776711.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/nenoxanul.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/xujibel.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/42222304949.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/ninigola.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/lobojigagagibud.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/pituromalipanobuberoza.pdfIn PDF document text
    • http://fairfresh.net/assets/admin/ckeditorimage/files/wavezatovekun.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/49055933782.pdfIn PDF document text
    • https://easyown.ddproperty.com/datas/files/mukutotusibot.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_off0000b717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB717 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF29 15872 bytes
SHA-256: 3b59b8de8c00f941ca822ce4c1437cff7bffa2beb2189dd1e34248f2863d5453
font_02_sfnt_off0000f7c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C8 10524 bytes
SHA-256: 4529b5b366b0e8373d761a510f015a41ef649cf4b110e67305ade8b4e2007d8f