Malicious PDF — malware analysis report

Static analysis result for SHA-256 0518d54acf11c949…

MALICIOUS

PDF

99.5 KB Created: 2021-09-12 13:49:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 46bc8cda1cd312355319aab19a971e0e SHA-1: 336d421790c23b7c144f93e14ee810193f267f77 SHA-256: 0518d54acf11c949c9d717465d2c16e8bdbf87b96c5517b7aab4dd256a54a316
204 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm and employs a password-protected archive lure, suggesting an attempt to trick users into downloading and decrypting a payload. The presence of multiple external URLs, some hosted on compromised CMS platforms, further supports a malicious intent to distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • 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://oniceh.ru/uplcv?utm_term=youtube+downloader+dlya+android PDF link annotation
    • http://gocchame.vn/app/webroot/img/uploads/files/fifexid.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/013c3944b4e6016631dc134a3d265a9d/8224972065.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/68584874702.pdfIn PDF document text
    • http://kme-kme.cz/files/file/zisuxa.pdfIn PDF document text
    • http://emeat.ru/var/files/15719571861.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/zapixeni.pdfIn PDF document text
    • http://kangshi-you.com/uploads/files/202109101548097005.pdfIn PDF document text
    • http://houselandia.ru/files/73023724932.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/75053881632.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/seguxabesukorerokam.pdfIn PDF document text
    • https://salondumariagededijon.com/userfiles/file/xutusope.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/18764373755.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/4865259.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/84266171062.pdfIn PDF document text
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/23793545495.pdfIn PDF document text
    • https://1snrpaulista.com.br/ckfinder/userfiles/files/88736200647.pdfIn PDF document text
    • https://rajakeempat.com/contents/files/64882864802.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16138398b1ad57---54066043457.pdfIn PDF document text
    • http://www.og2c.com/images/file/93837913689.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef47419d24---36792660116.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/sifedokowe.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/sinomunote.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/2b67a0ae7acb89eb9e375edec2b433c7/50965292664.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_off00011f95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F95 10496 bytes
SHA-256: 4e8ad4db969f1b8d6ddb9bef0d8a9423d2b9035aad4fd5cdef6ac758a52caf17
font_01_sfnt_off00013795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13795 18616 bytes
SHA-256: eebd6f4d6757ff08a629c7d5133f62f6b36b30014f88f656198c576c541c5959
font_02_sfnt_off00016841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16841 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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