Malicious PDF — malware analysis report

Static analysis result for SHA-256 0133ebbb3b2a505d…

MALICIOUS

PDF

73.3 KB Created: 2021-09-25 18:22:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a9972dcae470ca2c6328dd16e16fdc52 SHA-1: 5706014aab21a070e49726a4f9c6b897d1a370ff SHA-256: 0133ebbb3b2a505d6006d539323430ac1aee2c97e42bb7c6e65ddf2c7afba83a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It contains numerous embedded URLs that form a link farm, directing users to potentially compromised WordPress sites and other disposable hosting domains. The primary function appears to be redirecting users to external malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cructi.ru/uplcv?utm_term=redmi+9+call+recording+apps PDF link annotation
    • http://verypool.cn/images/upload/File/802452399.pdfIn PDF document text
    • http://namkhoabacninh.com/images/files/gadopovosonafaba.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/17266630253.pdfIn PDF document text
    • https://birotex.rs/images/files/fopazixuderagazo.pdfIn PDF document text
    • https://franchisefarm.franchiseharbor.com/files/files/60358648094.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/xepopuvirumekelabuvet.pdfIn PDF document text
    • http://sonarkella.com/userfiles/file/13275934168.pdfIn PDF document text
    • https://crbz.ru/userfiles/file/92644994792.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/58807699338.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/xozipusomabasezon.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/pupupa.pdfIn PDF document text
    • https://digiconelectronics.com/media/19084361360.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132369a6e8fb---nefabutonoxifemezafa.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/32074547158.pdfIn PDF document text
    • https://studybrilliant.online/app/webroot/img/userfiles/file/94082825882.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/kedegipos.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/90658270868.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/71871678751.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/094df0520c166c01b2ebd95674590fbb/xisewofa.pdfIn PDF document text
    • http://xn----7sbabjlebzbdsbxti2bw3r.xn--p1ai/files/files/xurotizopenuxuma.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/ecrbgtt5b66es3s01kbe1b5ds4/54341971181.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/luzodituzusoz.pdfIn PDF document text
    • http://floralojistik.com/userfiles/file/56417564736.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/jaxevenizafasidupepu.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_off0000b68f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB68F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA6 10972 bytes
SHA-256: 54f2a2c5d5d374caf01999cca6c9d31c08676783b0ded72e17934f60a6c3d049
font_02_sfnt_off0000e7d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D5 17808 bytes
SHA-256: cec472b504c7ccf5f311a35cd1a014df90d9ae7294e56c4fc1d972d7e7cb6020

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