Malicious PDF — malware analysis report

Static analysis result for SHA-256 5de49f64f1991888…

MALICIOUS

PDF

88.5 KB Created: 2021-09-23 06:46:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 609b19ffc947b0040444e3ef7c334606 SHA-1: 7cacd45c686ae980432a2d4c3ad975009dbe30bd SHA-256: 5de49f64f1991888c9b147194b5ec63f75206829343666ecb3437c923757e2ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF identified as malicious by ClamAV and an ML classifier. It functions as a link farm, with numerous embedded URLs pointing to various websites. Several of these URLs are hosted on compromised CMS platforms, indicating a potential phishing or malware distribution scheme. The primary attack pattern observed is the use of a malicious document to lure users to external, potentially compromised, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 http://motolargo.pl/userfiles/file/roralodutasi.pdf In PDF document text
    • http://crabandclaw.com/uploads/files/51450580323.pdfIn PDF document text
    • http://paulabenveniste.com/UserFiles/file/wumuxijozimeporumaxi.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16145a5048ab1c---meputexafawufa.pdfIn PDF document text
    • http://ateliergermain.club/sites/default/files/file/mubivaguvegedepoburapum.pdfIn PDF document text
    • http://universalgroupautos.com/files/others/18598718863.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/43531199495.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/xomukawolegovomamazuse.pdfIn PDF document text
    • http://grotech.in/userfiles/file/wijifinujet.pdfIn PDF document text
    • http://hig-hegmann.de/userfiles/file/budazo.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/derud.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/71586135537.pdfIn PDF document text
    • https://officialbacknumber.com/editor_up/libevusegewiminivezaxawi.pdfIn PDF document text
    • https://dveropolis.ru/upload_picture/77300669401.pdfIn PDF document text
    • https://incense888.com/uploads/files/202109101624226913.pdfIn PDF document text
    • https://zoldlaptop.hu/ckfinder/userfiles/files/lisoranelimozugad.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/4955101016.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/77160087090.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161466ec40e32f---wuxivelipejuvubimesovig.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/puzitigimi.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/vufipo.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/xukipewo.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/71785923886.pdfIn PDF document text
    • https://ourguarantees.com/userfiles/file/15800428806.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/be39ddf4a9dcffdbb31926f216b02d9e/pojedewuzurigilenas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=best+multiplayer+race+games+for+androidPDF 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_off0000f5fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FB 17068 bytes
SHA-256: 83a40d00886b0a7d66a109badbd41e2dface91b69c5b81be924336eaafa4426b
font_01_sfnt_off00012225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12225 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A3C 11232 bytes
SHA-256: d323d5951a4b3b25da7cdeda5908bea868047da9b5a4206ae4c5911bb452f84d