Malicious PDF — malware analysis report

Static analysis result for SHA-256 50e32b904cf5b20b…

MALICIOUS

PDF

78.4 KB Created: 2021-08-30 00:31:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5914abd12624f6c0245b71e887638fc0 SHA-1: d731838f75536c59f0e5966c5a6c1acab0fdc926 SHA-256: 50e32b904cf5b20be55f483fab6693044d297bb82c3513287d609b9cae46fbed
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress upload directories, indicating a link farm designed to distribute malicious content. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The primary attack pattern involves tricking users into clicking links that lead to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9e17df015---61897276125.pdf In PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c74f80ac58---ramuxupafaga.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/zetapesezoguxapi.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/vupadeduroniga.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/66018915083.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d65114d2f---xumeguror.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/77ded6082ef981f382236b3c2992b91c/50642217763.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/21551212926.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/metasuxamimumoladulutoson.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/disivarasez.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612bfb3c87e1c---27223408062.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/zofadonezaxokodugaduwode.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/2e1bd03ae5e71041582a5a99cd221780/dofewuwuf.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/93987485019.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/sovagoxona.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/e2806216d4f6da6c531a17107d5dec22/biwezazojukevozuduguw.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607255a8bc28b---damadixesoku.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/fekabovogeronobiwubibozaj.pdfIn PDF document text
    • http://bvsaigonbinhduong.vn/uploads/files/guwojezerotul.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fded85bb297---wopinitopavorodovamo.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/xosaxudar.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160831b0e7e2bb---regogodanesifexagevotoz.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/16404950494.pdfIn PDF document text
    • http://355353.ru/userfiles/file/jenine.pdfIn PDF document text
    • http://sushibelovo.ru/files/pafowawezokakuxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=container+closure+integrity+test+european+pharmacopoeiaPDF 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_off0000ce76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e68d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68D 11064 bytes
SHA-256: 8d4797c26d409437d46f0025cb01d581ca5bfdf3acb48393e8496ce9cacb9170
font_02_sfnt_off00010035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10035 16604 bytes
SHA-256: 9a1e26148a6b129a1ce06214b0aff104862ccbd59c3a0c0ecd625b9073640a55

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