Malicious PDF — malware analysis report

Static analysis result for SHA-256 4569c632f78dab00…

MALICIOUS

PDF

80.5 KB Created: 2021-09-01 03:45:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1f13969a0fe0561c048d9b5839f4c629 SHA-1: 23165f87768492e8ef30e563aedbae9d45dca910 SHA-256: 4569c632f78dab007af51180bfcd79037c249606fe83ad8bb550a84461050c3a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The 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 compromised WordPress uploads and other domains, likely intended to redirect users to malicious sites. The presence of external URIs and link farms on disposable hosting suggests an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://synerhu.ru/uplcv?utm_term=meiotic+division+stages PDF link annotation
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b65672b5090---28064381503.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/pt3m187ns01evicb6h3vd3kbq5/midobesodopi.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/99730888826.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c713b73fac---vobebijokutinalusotesare.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/ximoleretiramexuve.pdfIn PDF document text
    • http://coumert.com/images/file/lazavejo.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/saladowez.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data/files/bodugadinuno.pdfIn PDF document text
    • http://sbhs1967.com/clients/8/89/8985ce50e7417da620f75e2af787291b/File/rabidusiwuxeveloxumuvu.pdfIn PDF document text
    • https://subded.org/userfiles/file/tadokewupaxa.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/wemuzizovilenubiza.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bef2e5a61b0---nekabikuxexerowakipa.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/jumotefipozet.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/jitagagekojifima.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/befa5a9c2a81bd477299f7fca6744150/perogaku.pdfIn PDF document text
    • https://turasmobilya.com/img/editor/image/file/41041036460.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/lufexeke.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1608735fee1edb---vofexuvurewekabuwe.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/pelibuwamozujexerojew.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1d7fd8ad3---54011006913.pdfIn PDF document text
    • http://exima.kr/userData/board/file/53774807955.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3b70475b1---54707606898.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/6741954107.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/a1h3g9m0ulcdeiugl03gikodm4/zabogojowuvig.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8f0a59cf1---35510395109.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_off0000d4fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FC 10460 bytes
SHA-256: 1ca701aa09f0698303fd8d2a2328398a7ccd4f1e2c72c7f9545cca1c943e1e30
font_01_sfnt_off0000ecba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CC 17468 bytes
SHA-256: 9b3b6e7e4a816293baa279760992dbee0118b65894058b59a7c3a264297acbd5

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