Malicious PDF — malware analysis report

Static analysis result for SHA-256 37bc429b98797e51…

MALICIOUS

PDF

80.6 KB Created: 2021-07-14 09:31:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: ff37da1a1079fd889db8f09df288c700 SHA-1: 253e992af7eb39e03339ae13ab276f3e67ead068 SHA-256: 37bc429b98797e51adbb5d455f4dbe452a5d34dfa8e3c506d589d48fa52d256c
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 malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm with numerous URLs pointing to potentially compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of many distinct hosts and links per host indicates a broad distribution effort, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2610a9b517---9002596897.pdf In PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/f623dddf6561b89f30e5688f41265a4f/59013978480.pdfIn PDF document text
    • http://voijin.com/userfiles/files/wutitipipiki.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/suviwutomelud.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/batavax.pdfIn PDF document text
    • https://jagamimpi.org/contents//files/92678006372.pdfIn PDF document text
    • http://imbirimbir.ru/files/27277285553.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/fb62850afae4e2caaa0157aba18eddbb/11025365287.pdfIn PDF document text
    • http://sciattella.net/images/file/32456673542.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160732432098e3---43029561678.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/vpbg07v218m572b3qj42q0a8gd/jateromakepewebuvufirevev.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e97c3753428---93531538648.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/ak4i4rvg4giidubv2jfll4uhup/winidekivokomanolevakeg.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a3689981796---67174342825.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/160838ca35e24482569b016c749095b5/98178293577.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/b00b5c6d30997b148dbcf36e69ad2600/wavafopiwez.pdfIn PDF document text
    • http://austintownfitch1980.com/clients/879833/File/91939882699.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/77015649928.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a977b957524---fubukidaf.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/vejafa.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/28fb9ef3614c2f3b0df58f4fb8a454c6/8587835031.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/cnvaellt4d01m85icvlp5klnqo/27188870144.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/kvj8jrku4ffsre6r3cm2rghpt4/tefozu.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/37143074d91c2cd164e5f45cb61d5fa8/36216770923.pdfIn PDF document text
    • http://smart-ventures.ch/upload/Editor_Images/files/93991790962.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c3294c70d---87821611636.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=audio+recorder+and+editor+apkPDF 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_off0000d663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD663 17944 bytes
SHA-256: 92648d1b4157dbf4a2a20b5d770622b06a99106ae20c081f83452423bd9b9547
font_01_sfnt_off0001054c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054C 10464 bytes
SHA-256: f7972e3ed8fad71f5aa7e5d11f39bbf719692cd855dfe1b076fef9d969c0c319
font_02_sfnt_off00011d33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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