Malicious PDF — malware analysis report

Static analysis result for SHA-256 bff40b0c4205794e…

MALICIOUS

PDF

71.4 KB Created: 2021-09-05 21:04:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3a8487ffb10938b501ed6aab06581e5a SHA-1: 9c3d7f98108bbdcf1eea740ebd978bbb6e0010ac SHA-256: bff40b0c4205794ee717cf60c626f2705e57ed28dafd8231c29a0b0ffbb079d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The PDF structure and embedded links indicate an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://djennebeads.com/nbloom/fckuploads/file/20219712911.pdf In PDF document text
    • https://villadorottya.hu/uploads/frontend/files/watak.pdfIn PDF document text
    • http://vanxuantravel.com/upload/files/zadikobokopivufefawi.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/97580186543.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608609483f461---40060931860.pdfIn PDF document text
    • http://mkbeauty.vn/luutru/files/xuwonupubuvuzolejutew.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5abdd46b49---vixepusujezigefobiburid.pdfIn PDF document text
    • http://hhsmelt.com/upload/files/tomev.pdfIn PDF document text
    • http://autofulltravel.com/userfiles/files/tojatu.pdfIn PDF document text
    • https://vokalensemble-vocembalo.ch/userfiles/file/73983575578.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/wuxofu.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/mhg0g57hu7joj7dbsh5irdk496/vezonugapanijagagamun.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/lesaxilipalubakugafisedod.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/15608174188.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/aa1d69e129ba25cdfe559692a382c71a/bipuvunidojevu.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f12eda3a94---14912205387.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ed549e412---60779809982.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/b987849a241fccc1bf86009e448f5c3a/nigofosomupe.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/16447206038.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/92183686530.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/3nkfa6ojiffco4i99mb9kpjm26/74354624967.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/4371279792.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=sigma+notation+worksheet+docPDF 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_off0000b7c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7C0 15360 bytes
SHA-256: 9900f288a38c9cf9f8db4d63929f0201f4b5a8bfd637350d859670e6c4e201e3
font_01_sfnt_off0000debc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBC 11024 bytes
SHA-256: d78984771148079aebc2827b9a55fb9078a2bf743a3898ed6672f61816bb57b7
font_02_sfnt_off0000f80a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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