Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd34080894e7b93a…

MALICIOUS

PDF

80.3 KB Created: 2021-09-20 01:45:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2ab2cb0d6c66e3441f3d75cb573cce06 SHA-1: 6b3135ec9d6079a2142e800b85557023f097bcfd SHA-256: fd34080894e7b93a101af98db077729e3b32588d27475e159425ce684a48ee50
236 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious. Heuristics indicate it functions as a link farm, potentially leading to a browser extension installation lure or a password-protected archive, both common social engineering tactics to deliver malware. The embedded URLs, while some are marked benign, point to a pattern of hosting potentially malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 http://vitalenzyme.com/uploads/fckupload/file/turoti.pdf In PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/fepak.pdfIn PDF document text
    • http://ke-sen.com/userfiles/file/1630933115.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/869c14581bf48f218771a280b49a17af/42318737792.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/86454286950.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/93309805426.pdfIn PDF document text
    • http://sergeisurzhin.ru/ckfinder/userfiles/files/3476739188.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141102f6818b---23006166935.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/zomazeguniwom.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cae444dcbc---vikad.pdfIn PDF document text
    • https://tomaszbizon.pl/web/uploads/files/sixowixibarinopuj.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/ziwinarokerekibidosos.pdfIn PDF document text
    • http://rund-sro.cz/UserFiles/File/71043035430.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/ratilotuxu.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/94734269346.pdfIn PDF document text
    • https://www.pollackmihalyiskola.hu/ckfinder/userfiles/files/52867889413.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/18963302938.pdfIn PDF document text
    • https://agregadoschucuri.sinecsas.com/ckfinder/userfiles/files/86475407163.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/61643432068.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614415d7c7230---vakibiwumaj.pdfIn PDF document text
    • https://raselapp.com/userfiles/file/jeretomedekuxisigokef.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/rosanovimisawonopa.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133be6747844---18542100651.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=allcast+download+for+pcPDF link annotation
    • 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_off0000d5bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BC 17668 bytes
SHA-256: 8df55bdc3216568484c9572eca596651dc81b90ee560faa4307c9c2e68d2b06e
font_01_sfnt_off0001034f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B66 10456 bytes
SHA-256: 27b1b4570fa52d078d26615afe0cf4be90a39d0cdc1de8e47a1e5670dec407b8

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