Malicious PDF — malware analysis report

Static analysis result for SHA-256 3abeac7a4eabba81…

MALICIOUS

PDF

76.8 KB Created: 2021-09-02 23:49:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3d4b6649138e7bfade6b76af7a1bcdbf SHA-1: ba9c4d6f6ea4871cdae5f7c67cedeed0caa3230a SHA-256: 3abeac7a4eabba81eb868e8d33c1b5b3c5140689b3a634de4fd189d3a0183915
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various websites, many of which are hosted on compromised or disposable domains. This structure is characteristic of a link farm designed to distribute phishing content or malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://htwy.com/upload/file/6364525290.pdf In PDF document text
    • http://cluboutletmoto.net/campannas/file/dodigawaniz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d7aa642e2c---witaxarowosogidir.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/3bbb1be8ec80e262a75b07e23922cfba/44983079602.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/furenane.pdfIn PDF document text
    • https://familienbilstrup.dk/ckfinder/userfiles/files/duzujetagudupuruwa.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/7109b4a74c3bd05f1d6fa32a1106559f/nojasipasazaxiduzeti.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612510c9aa9c9---losakubonubejafaluj.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be6adb78546---76657775039.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/p4cvhb3bhqc0g7gnpnuesm9i5t/lodafa.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/91153250566.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/88032187526.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/17885842577.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/93740740447.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160cd4da9a3159---mivuzilusifibukakawapejuv.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/70657486478.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1dfd54a4a---murolepitaxofu.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/debubisemirukigonakopewir.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/waxegisimozuvejolusok.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/7c51c8dd890554bee6f533dbe1bda9a1/53788187129.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1610d37fe20820---xasodi.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/lolagufukugiwowiwiforami.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=converting+docx+into+pdf+in+javaPDF 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_off0000c419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC419 10912 bytes
SHA-256: c9c0b96750da427696b1a31b4bf82e2b1741b0e4b83e63e803913786f2e1af28
font_01_sfnt_off0000dd57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF569 18288 bytes
SHA-256: 00fb5834fbf36e1739d9c632e40fcd56cdd3ed4406eae870edc009609aa7670d

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