Malicious PDF — malware analysis report

Static analysis result for SHA-256 3753c0a0e0815f6a…

MALICIOUS

PDF

110.3 KB Created: 2021-06-26 01:47:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 5a205b3cdc2e95c3d785d9ebf6af83ac SHA-1: 995fbb71cce956bfcba41bb2d2c06f6891c79b02 SHA-256: 3753c0a0e0815f6a2ee2390d5f31bdc8386fa83785bf55a9ef54823d6efb8d3e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised WordPress upload directories. While no scripts were explicitly extracted, the presence of numerous external links suggests a potential for downloading further payloads or redirecting to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9664

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://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/jra82po87nq9i62vifjo7h9f3b/pezunavu.pdf In PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/c7fd26de540a9baaaec1ee9ff2bcb9fc/75710048163.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607766f89f014---40755281229.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/bubonozikekegiz.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/37062cbb6526cc08b5d05edb4682a940/poserivorepi.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160add7ba5238b---38467849721.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/61329161935.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210504060534518253775.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094841762b3a---45480348432.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/70153486cdbedb104a515bcbbd3d2f48/gubededatobajifufebewad.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/94243708750.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/gqggai2dbql30vv9d1aqcrgqkt/movizenivigosidowukap.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160956638bc61c---16582414415.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/qrk6pjeh96r0f6ck7i06l9mfdu/3595754404.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/237a775b0b3c7e810bd21fbd59fd3395/72602372402.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee419d6cfc---10028872981.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/2323e338d6ebe78bf447672f8a2eda32/30871682600.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609a27dbe9da3---78292491066.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2796f906a4---37657123922.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/f6bc658a423fb648a6dd42ed42a75695/76163545306.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/fuxowesofiwaritudafitati.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/89506147634.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/af6a4e7aaeb4b8db3d3d15ebdde01731/84827477446.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c58aac7a443---wopuvudowafapelu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=which+crypto+to+buyPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2C 22080 bytes
SHA-256: 11697b02d5306aa64f9b111e84610dee2c04b840f6ca5428693ff8cdb1ac728c
font_01_sfnt_off00013839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13839 17828 bytes
SHA-256: d211795e96dd7f70f25a63866da9a7c724c02fecb5317360e03b1099e2299a22
font_02_sfnt_off00016726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16726 10204 bytes
SHA-256: 266aa2cc12b28388377e576e9cb055c1b2f466aa9233c7045f1275aa590d7272
font_03_sfnt_off00017df7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00019608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19608 16060 bytes
SHA-256: 7e09a3551a5f95464d485b0302bb2ea5a0fc1ccd586ad0b46555f182e6907fed

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