Malicious PDF — malware analysis report

Static analysis result for SHA-256 d09fe84abd15cd41…

MALICIOUS

PDF

81.9 KB Created: 2021-09-01 23:10:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7fe5c1b3ab1337e03058cd6ad3835df7 SHA-1: 5001a077d710a9930f38c943e92e70625e5b9a91 SHA-256: d09fe84abd15cd418abe4969d1882f23470428318ef9fb879001a3d47ad11c8b
204 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics suggest it functions as a phishing lure, presenting a fake download button and a pretext for MFA harvesting. The document contains numerous links to potentially compromised WordPress sites and disposable hosting, likely serving as a link farm to distribute the malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://digireg.pl/upload/48410996910.pdf In PDF document text
    • http://adance0112.com/upfile/editor/file/gidazelafapoletoguxobuxa.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9189342b4f---32408475887.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160725e627b98c---35590492620.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609860afd0b57---80361629367.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/bddbfd3e828a5458332517ccf511fd4d/59321836440.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d8008928c---sexonetizarigo.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/fesusuboxujokavaxotijog.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/55969212356.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/23873029410.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/83570581800.pdfIn PDF document text
    • https://doitoutdoorz.com/file/F2jZTfj0p4rTo460.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160864b4d60ece---26415517595.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/ninasuwunidabu.pdfIn PDF document text
    • https://mavibusiness.it/file/58859776605.pdfIn PDF document text
    • https://capecoralliving.com/media/file/94753504651.pdfIn PDF document text
    • https://duvanco.be/docs/files/sikulilim.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16118faa49044d---50460464836.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd77223e4f1---dalikulenelupatajimi.pdfIn PDF document text
    • http://chinahongji.com/d/files/19591411040.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/52434173181.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=android+9.0+google+account+manager+apkPDF 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_off0000d970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD970 18052 bytes
SHA-256: 4c6b42684c95dc52e5e68da1f17395be5a25ef05500d86919cf1abc9001e8fb0
font_01_sfnt_off000107a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A6 11216 bytes
SHA-256: 4f7a2c77dadc045128eb193ffaf3277969391a49a067fb1baabbc99d02539815
font_02_sfnt_off000121bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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