Malicious PDF — malware analysis report

Static analysis result for SHA-256 619c91dc6b4cec97…

MALICIOUS

PDF

86.7 KB Created: 2021-08-03 23:25:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3ec415b0cdeaad978668629e6b1d69cc SHA-1: 04e992f3e4d549ad553f141e8b13e8dcb6f46d85 SHA-256: 619c91dc6b4cec971b7bc968331f90e9447ed02bcc7d677bb4c973b8d8ec8e05
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The primary purpose seems to be redirecting users to external sites, likely for malicious activities such as credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://crysiq.ru/uplcv?utm_term=wifi+password+revealer+apk+free+download PDF link annotation
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf124049898---pepolaz.pdfIn PDF document text
    • http://srsheicha.com/uploadfile/file/pujovemesonimid.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607a08438f19f---37557432729.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/343d3e8a1eec5c83b1fdff682fb7bb6e/24427231574.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/lidodarug.pdfIn PDF document text
    • https://amblamy.ee/upload/file/vilizopepebunumusugevu.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16075e7d292f17---nepiviruruxeris.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/31868487827.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160984bdc9ad39---benina.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/62bd8865bd224cc6bc1a3663571e3d9c/79916372138.pdfIn PDF document text
    • http://hud101.vn/webroot/img/posts/files/satuditesavojetalegi.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609494c6736f7---kepokifokukafefus.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/80218535050.pdfIn PDF document text
    • http://radis-rrl.ru/userfiles/image/79771289719.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/13600634000.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/02u78lndbc21ecib25gd079uk9/nozizo.pdfIn PDF document text
    • http://train-in-japan.com/images/blog//file/vedimiruk.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16082bc6099c4c---rilovujexaragewetodut.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/15276472973.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/17472170000.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/42689613760.pdfIn PDF document text
    • http://xenangheli.vn/public/files/23323139413.pdfIn PDF document text
    • http://broadmoor80.com/clients/866172/File/69280041114.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f5d9dbc04cb---tokesizezimaxuvivas.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E8 10628 bytes
SHA-256: 74550cfc2a0e773d4ce30cc043e75fdaf7922282a186b94c6294930ca76a5ea9
font_01_sfnt_off0000fc58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC58 17780 bytes
SHA-256: 00bc54f168b15862ae158e15e0861c3207f05b40a24ea5b8a15a17c283d70806
font_02_sfnt_off00012b7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14387 1672 bytes
SHA-256: 3f1748778f03e7b7e2d3a6c88ca15ef060a02f224cd71155e662fde9dd4c56c7

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