Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e878b9856d6e58f…

MALICIOUS

PDF

70.0 KB Created: 2021-09-05 19:46:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fc4db0ec43efbda1bd6a9f159b345e31 SHA-1: 1659bac0303ada6d2842ecea679d14dfc57f0273 SHA-256: 1e878b9856d6e58f697bd7f057c37199693eee825a3a9b927b9b3a782bd10cd2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of embedded JavaScript suggests it may be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://angelescare.com/userfiles/file/jixup.pdf In PDF document text
    • http://mini-garden.ru/userfiles/file/zoxudul.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/0kc3m3l44sjgghgvibmivads12/vomikenilefokapajipol.pdfIn PDF document text
    • https://medtek.vn/storage/file/zitod.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210707064447179.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/rulofisunimap.pdfIn PDF document text
    • http://hindel-relax.ch/ckfinder/userfiles/files/13829819022.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/7eqkif1r7vljm8tmqgnjhv6qm0/92507871574.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/161029b860f9be---dafevesumajewumudezam.pdfIn PDF document text
    • https://safecampus.in/cmsCart/upload/file/lozukiv.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-8-3/20210803021541881875.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/61997580941.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/30355541588.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/oc432lf1e7a53n8mmprgog65a3/fokodixumafavepawisesos.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/4171127933.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/74806288873.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/0e2c038a18ab67140f3328c956d2857a/zelabaneropuze.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/86024104162.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/129bab36ccc15d3ff7782efec8e617c0/54933790574.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/98841892202.pdfIn PDF document text
    • http://autostyle-japan.com/js/upload/files/sifutudunugebuvi.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog/file/wagobesuvezujem.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/nuvoweputomaluselagifoge.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4ad52e1fa---jinolisusulasavisujavox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=productividad+secundaria+ecologia+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_off0000b405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB405 15052 bytes
SHA-256: 1bc77519b4d3d78acabbf4eb7310b9da06283a524fd2d1268b6476a15d46e6f1
font_01_sfnt_off0000d8e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F8 10960 bytes
SHA-256: b01fe98a92836a76c2ec5ee2ada0f8e655f2bd06ecf229425d0b7c70df3a9eb8

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