Malicious PDF — malware analysis report

Static analysis result for SHA-256 c17db02e4cfb0446…

MALICIOUS

PDF

81.2 KB Created: 2021-09-03 21:06:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c581ae54b882cca349fef9b4d1cc5b9a SHA-1: 71964068ba1deca0bfca25eb7f763ef3e33776ac SHA-256: c17db02e4cfb04461288c9877493afc1c8433c33467094338e7879da66792d01
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF files in the URLs further indicates a potential chain of malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.srijonihealinghome.com/fckimages/file/varadofijetijevof.pdf In PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160c266cba262c---gegepuku.pdfIn PDF document text
    • https://lacausedeslivres.com/userfiles/file/mebomufu.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/kisixixoxevikaridokefuka.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/tefekekafuxal.pdfIn PDF document text
    • http://goodwill.as/userfiles/file/63371160612.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a569399e416---zenabidodumosi.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/314c9fa7cdfb2a0a206ea8c018a0d2f5/25775619068.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a961ba19226---kukovilixuka.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/jj2k7am44ulrsdj0tgum4su35n/votodawebawetiwesi.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/jizibigabajoduvezinamigu.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/vhh75vg4s7r3q8dumcbtapnra7/vebakugutesaguzamavawakat.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/j1dbsibsn32709rf3v6n383ss9/lubowilozeles.pdfIn PDF document text
    • https://buka.ru/sadm_files/52941758072.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/7b47b776a17e10ed9ac6b3fb6ae1f09e/60751116815.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160dfcb3674635---24912933120.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f901f68ac3---muxitozokigoxirovoz.pdfIn PDF document text
    • https://buka.ru/sadm_files/64332179339.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/98158060414.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/ld6278d43d4nl51tsv7rpqd7pl/rufononowukurukomina.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/tenukidigomid.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160cbb4b88d224---48506078713.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=car+rental+application+fillable+pdfPDF 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_off0000db62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB62 10616 bytes
SHA-256: 822dda72b99727acdc4afbf51e57abf0f6777343174d25b22116b9100fe130ae
font_01_sfnt_off0000f37d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37D 16672 bytes
SHA-256: 650aa91460ee989866ce1b57569259be2917a25a4625b7fe0f5fc5733df8909b
font_02_sfnt_off00011ecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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