Malicious PDF — malware analysis report

Static analysis result for SHA-256 e04fc86a5053c578…

MALICIOUS

PDF

88.1 KB Created: 2021-09-07 03:15:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b48002d8a2726c7a16361504011e56db SHA-1: 948d103a4a8660c77eb521a7f31496905a194b65 SHA-256: e04fc86a5053c57858b589a70389d70a5f113a73867e30cd051b01e80b9feff2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. Although no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly indicate it's designed to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a52f5f4925f---31684344373.pdf In PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a52e201b7d6---77152322260.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/c115875aae05712c79f27f3d929fe731/lorudubex.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7f99ede05---mitisujurexudiba.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/92175434959.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/rosubufa.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b90a3803763---rogekotegujel.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/batipupi.pdfIn PDF document text
    • https://rajakeempat.com/contents//files/kibirixadu.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/lolowunurorunumudilipiti.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/fikupisefibuzawizigijok.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/rujolujatixadoritukopod.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/2f9c51f993195df0cbb72f1cb50e5333/77031842935.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16089e332dfd91---digorodir.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/zavemifajipijoxa.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b92018e42---segeji.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607da14eec9d8---bajafetixajexiv.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/7327745390.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/naferupudopewuvafonivoliv.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/27964003917.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=motorola+g6+play+manual+espa%C3%B1olPDF 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_off0000e22d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3F 24236 bytes
SHA-256: fac7c630a8f8082df6c4b40f27db8c6699d196f5f623dbba59a9d292bf025aca
font_02_sfnt_off0001372a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1372A 11084 bytes
SHA-256: a88df474557fbbde96615191fa60940e6427a6897e66954a4c97b5c4d0601616

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