Malicious PDF — malware analysis report

Static analysis result for SHA-256 77c6864c9d0322a8…

MALICIOUS

PDF

83.7 KB Created: 2021-07-17 22:33:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c9bd8a85a4382b77685ce279822ac1f3 SHA-1: 3133362714e054b3c7307204d0a0c6d462f6ddf6 SHA-256: 77c6864c9d0322a866b6abbdbd1d2ac1f03a1dcd9b30d68355310dbd913e7aa2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and multiple links pointing to compromised websites hosting other PDF files. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a pattern of using compromised or disposable hosting for malicious content distribution. The embedded JavaScript likely facilitates the redirection or download of these malicious files, contributing to a phishing or malware delivery scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/6e55fhcqfbed8u68iie6q5k5sh/tujoromelibadud.pdf In PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b59c70087c---52893690045.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/17716008690.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/7c39537b2f9470f524ebdf0f2259f5b5/vogofomofemukax.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16081ef86c407f---fezamenedilunenepu.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/6f0f77492e25491136d3c2b02f3765cf/29797662870.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847fbb46080---viwolevudivoxebabixew.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160927aae35904---rumusa.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5599650de1---82016657314.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3c2d48f76---57671783369.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/76887907923.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/2972669639.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d7f55513e---leguzadoramuwirofad.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/famozetazobowaxuse.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/xukatotifakopowopu.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/84167860258.pdfIn PDF document text
    • http://vds-construct.pl/userfiles/file/supeponolisasepeb.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/97677242556.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811077b3d38---42520745009.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aaae0231fe3---sivisuxozamasus.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/88262159317.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/81835809671.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=types+of+commas+in+englishPDF 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_off0000e140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE140 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF952 18692 bytes
SHA-256: 1620893444aa4a911f735944db78b913fc903b3fcf85af25dd0f65ee9b6db19a
font_02_sfnt_off00012907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12907 10804 bytes
SHA-256: 0c3eece33066fdfbf9b1831b15350d387853a080812c4986b9f0e92aa268fd3e

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