Malicious PDF — malware analysis report

Static analysis result for SHA-256 163d87a807404962…

MALICIOUS

PDF

97.7 KB Created: 2021-09-03 22:00:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f8d31c80c68a0cfdbd17cf3a45f33182 SHA-1: 2dbc0b337f4c9dd4fcc695fd04d80f596ad89c91 SHA-256: 163d87a80740496299c0ab5863b704dc874bee1f31196c9a942e84627d81c437
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, forming a link farm. The primary purpose appears to be directing users to malicious websites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/d6ql3p8ubb24oubi0m8j0p1456/gomuxujemovazakitu.pdf In PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/2522388ec4ca22ddfe043b9785b098b8/90088288196.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613196a44d371---xadozapawubex.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/zixifegezupon.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/lirodegufafolofi.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/7d5fe86c1bf90533e14efee507cf3726/bamarizimotanagapader.pdfIn PDF document text
    • http://aimic.com/userfiles/file/41998402977.pdfIn PDF document text
    • http://renovator.cz/files/file/56463756427.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baeb0bdfd98---85904746813.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/86412608853.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/zabopotiwexudukuvifasevi.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/0jdbv42jcsbe6k5c2is42hpmt3/83085919584.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/1857600958.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/4873215474.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a074afa9c75---kuwitabobawujojefekoj.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/10902208132.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/6ad77b7ba4883f72490d6ac3a818f27d/pivigetiloremoxupufazep.pdfIn PDF document text
    • http://www.tekkoo.net/images/library/File/8632073635.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/jinalopoliboferizo.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/65123294379.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/38053568912.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4c7fef11b---37307249765.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6ed8db1af---sixegetulovezutogoken.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3bdb49b7f---61285327439.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/rokatemasidobexevumasola.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c6e0e93d2---92055831602.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=vigilantes+do+peso+tabela+de+pontos+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_off00010e58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001266f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1266F 10684 bytes
SHA-256: 704ab94517462c8cc221e9b7c9e23268d3fec3586c42c1214eb85f8d1238783a
font_02_sfnt_off00013e9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E9D 23696 bytes
SHA-256: 1ce4691c0067484dea0ac80908ff8a53a6e69f2d946eeb9c04553a98fe03e04d