Malicious PDF — malware analysis report

Static analysis result for SHA-256 d97e8e9db82b5b37…

MALICIOUS

PDF

88.7 KB Created: 2021-08-05 09:08:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fc244c2d70a0dea84fe5bbfb25510390 SHA-1: e254c132d84bfb7665f6facaab63dd69ea769db1 SHA-256: d97e8e9db82b5b37c75fb6a5746e5791474d465a58f2075acdcdf6fbef53d186
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm pointing to numerous websites, several of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • 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.
  • 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://aiswaryamatrimonials.com/fck_uploads/file/botezamerizosuwunubulujo.pdf In PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/80452042dd288b29aa7e6f77100ea8e8/66672460497.pdfIn PDF document text
    • https://5uempat.com/contents//files/fukej.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608afbcb1c097---68095687414.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/zavexukivajulup.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/xujetesivififiliw.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0470dd555a1e30e324223b8fec286822/51404077673.pdfIn PDF document text
    • http://poiskvod.ru/images/file/40499182724.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/mutexipiw.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/e40e4c4dee7378a4d3242e0b48e02751/nekaze.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/af5bcc0bdb20379a37bb49856e50399f/netidoveko.pdfIn PDF document text
    • https://nepalimodelagency.com/userfiles/file/vuxokukofomurejoli.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608002dad2b77---46180830997.pdfIn PDF document text
    • http://euro-ex.net/images/blog//file/kabarezawero.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/90252016157.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16097d6df3f6ed---tojawep.pdfIn PDF document text
    • http://octapus.vn/images/uploads/files/bulabub.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/1709261406.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/dusorujujix.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/sipuruduvujajovikoz.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850c9ebf287---babatukumawadaz.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/sojuvutoxapage.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/o7lg3succun9ut96clm2sm1hv5/26921584102.pdfIn PDF document text
    • http://delta-serwis.pl/pliki/74941649155.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+do+you+write+an+autoethnography+essayPDF 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_off0000f84a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84A 16792 bytes
SHA-256: 9f792fb5782bee40e9450c1cf0b4edadd774deebcad405f6a8a777e4ebe08ead
font_01_sfnt_off00012346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12346 10916 bytes
SHA-256: db066017b961424000fec4ff84ff1799fe228ff5fab15f5dddcd7d0b0510a99e
font_02_sfnt_off00013c53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1