Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ba78ae184d156fe…

MALICIOUS

PDF

86.1 KB Created: 2021-07-01 11:18:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 17945b26da3a5ed2ece559caf39cdd33 SHA-1: 30b9807e3f5785c944b0cd236ab06ab3f0dde5e2 SHA-256: 8ba78ae184d156fe1b9e61b3ec1f4cf4fb1789a80d9042e8a7f005d0c3d47f6e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as containing a link farm pointing to compromised WordPress upload storage, and was also detected by ClamAV as a phishing trojan. The embedded URLs suggest an attempt to direct users to download malicious files. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://jpjplumbingandheating.com/FCKeditor/file/zizeboluloja.pdf In PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7e4a19b598---40386541007.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607702ecefbb9---47073366635.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607782ee0f074---9544424345.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/dufigukamurafatidokoguki.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/56677433271.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/2cbd3d9bcd994467c38bef78d02a68bc/28636403159.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/81215978ab0d234385a3c466ea7fa448/minoradoxexitisa.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/lojofolita.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202104/file/safudoweje.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/be03e61843984d661609f32814763a74/10258279953.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/9b5449485de5df4c0c4e16a0aed7f0a5/sozojubex.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///sedorabukitujom.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c1dd221a6---53074547400.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/62994115468.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/6bdf8501a4ce3194f1d88d6dbc671b1c/kogujaponuxonogada.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607b08aebd334---zuxezenutuje.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/83278880941.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082f727c37b2---4119071562.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/28140380760.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4426be33e6b2a31a492470dfba0835a1/gigejekupexibafebi.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/50oq40fmhfm6e0cojh57nfuvqc/9464469585.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=house+of+waxPDF 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_off0000f13a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13A 10044 bytes
SHA-256: 30f985b2d9520a0ce223fcdc0bbe5c39fdeb49016e79673114628f714443991f
font_01_sfnt_off000107cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDE 16844 bytes
SHA-256: 58faf0dadaab258e5ca4d9e0c0fccce3e621bf6efc0ce42f8dfa9f67f4166528

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