Malicious PDF — malware analysis report

Static analysis result for SHA-256 c63555022169db5a…

MALICIOUS

PDF

84.5 KB Created: 2021-09-20 08:27:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c406d0f8c9587f2c5f9d1e7f8b0066cb SHA-1: ceaf6b894c11e5c413e726d86702abc8c8fde8fd SHA-256: c63555022169db5a1b9e3d965a3b52e64816669b2bbaf9be553bb421ba88ef7b
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malicious redirection scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to malicious content or exploit vulnerabilities. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://thuaphatlaihoanghuy.com/uploads/files/pajopegip.pdf In PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161409e0a70974---ginojoputuwa.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/rigikapafaresuvigetedawuk.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/70081928983.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jubukezixifapolokotagis.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/78333897699.pdfIn PDF document text
    • https://onlinendttraining.com/files/68596757815.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/161477e0921eaf---kamakuti.pdfIn PDF document text
    • http://cutyoursupport.com/userfiles/file/42079384855.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/jewilugijerupokono.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/hqmdo9tem0q0klvqhfpu0s1c81/xivujesonuvuwa.pdfIn PDF document text
    • http://www.sunriseacademy.in/ckfinder/userfiles/files/makor.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/76565949105.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/q2p7r8buncablh7rd392e8t20h/56399207477.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/5ee2cf64133bff04d5a62d75f3d35492/birozanonunibavu.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/37770495058.pdfIn PDF document text
    • http://arucax.am/user_images/file/watonanuxowabexukixutov.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/bujaxotaramanofogomi.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/4702306995.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/gewepavoxojidaz.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/leregisipevin.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/74863321939.pdfIn PDF document text
    • https://metrosecuritynepal.com/assets/userfiles/files/79821840720.pdfIn PDF document text
    • http://lngpetro.com/userfiles/file/geteritosipetilaperokir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=positive+adjectives+that+start+with+the+letter+rPDF 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_off0000e5f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F2 17672 bytes
SHA-256: eec6849997405387a57b5250bac80c31ccc2323c47ce3c27eaab0562e46371f0
font_01_sfnt_off0001137f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1137F 10644 bytes
SHA-256: 99263895016d3ba2fc362b45cc250eeb67334c27065fb1d7600f87a3d50e46ab
font_02_sfnt_off00012c12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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