Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec4453c0c51b4ddb…

MALICIOUS

PDF

85.3 KB Created: 2021-09-20 18:35:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f190465fd13ed8437b0af1869d1f6ff5 SHA-1: b15fd1f254e4b43eb38b70021507591a5b2dc47e SHA-256: ec4453c0c51b4ddb22127796d80d625b16f5bcd2440ca69806dc2d158837c63a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which appear to be compromised or disposable hosting, suggesting a link farm used for distributing malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely provides a password to decrypt a subsequent payload, a common tactic to evade gateway scanning. No scripts were extracted, but the PDF structure and URL patterns are consistent with phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://synerhu.ru/uplcv?utm_term=how+to+reboot+moto+g5s+plus PDF link annotation
    • https://bhiringisamsankalimandir.org/userfiles/file/motejexe.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/zofogamel.pdfIn PDF document text
    • https://hijaulumut.com/contents/files/96654923905.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/govogakusenawekujuvaret.pdfIn PDF document text
    • http://ibrahimalsada.com/pics/file/61894619717.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/9dc9611aa2573166086aae81f349baea/tutafatiwo.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///29822277043.pdfIn PDF document text
    • https://xuanhongkhang.com/upload/files/97867403595.pdfIn PDF document text
    • http://riverla.vn/uploads/userfiles/file/9415009957.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/bolejejizetobod.pdfIn PDF document text
    • http://nanouklid.cz/upload/file/xorerovo.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/8389431238.pdfIn PDF document text
    • http://captainkillmite.com/uploads/files/202109090025108129.pdfIn PDF document text
    • http://infinity-c-t.com/userfiles/file/77484946367.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/8b30d933e20947b8dbb1b9494118f6cb/35626663642.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/94167688884.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/7092b8b69424e6229858dd41913d8fbb/95732872111.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/161478cf7d2fb7---xowaxibobixipogewas.pdfIn PDF document text
    • https://clinicscrm.com/img/files/nuwebol.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210911_D14F922B6C408D9B.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/f69b4882aa9e55af36f1db631a5999dd/xumotamagubiraliteje.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613626f5ee662---zoxufa.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-18/20210918111346616342.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_off0000e45c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6E 19400 bytes
SHA-256: 1a6a49264ec0c145eb1a6b545980d0b63e58afd3c5e3e06cd7431d9c638bdf3f
font_02_sfnt_off00012f27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F27 10688 bytes
SHA-256: 25f309ed386c510fb14e2e108f59ea73c5e466b90f2f523da34aae773f151518

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