Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6f1351f443aa033…

MALICIOUS

PDF

83.7 KB Created: 2021-09-02 08:09:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f9eb2e6c7522bcfde47173cfe473921d SHA-1: 941cf55f9d23f3aa221f1c7cc67d39e325c71184 SHA-256: e6f1351f443aa033f54a2b15385647d27506a420e40c0ffff9c62f1361e572e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely to host or redirect to malicious content. The presence of external URI heuristics and link farm detection further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6969daa06---mewuz.pdf In PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/889e53c0f242ebc944a8f04513b10e48/pikanofunutefomulo.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/segelaropavuxuj.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/muxebepidenekegakuf.pdfIn PDF document text
    • http://huntland.hu/upload/file/23700300091.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/xededoramurusobuxukim.pdfIn PDF document text
    • http://tauroconsulting.pl/userfiles/file/84310475889.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c92da021eb2---xegip.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/38481022007.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a2bebdbc06---favofozebabapatovepajum.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/26043396885.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/d124371c7932d653750ed738cbfc4051/70046403678.pdfIn PDF document text
    • https://lapakunited.com/contents//files/dakirimejiguv.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/95335654167.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/lerojexuv.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/d5d2f10c8958c7417530fdb485dcb7fd/14162468759.pdfIn PDF document text
    • http://ayurvedicclinic.org/userfiles/file/61618021802.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/situmimegimisakimuju.pdfIn PDF document text
    • https://aashianarealty.com/file/93805204065.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728ccb7be3a---giwugeluvowux.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160760efe6d506---fonowatujamogogifilis.pdfIn PDF document text
    • https://istanajpdua.com/contents/files/72241229568.pdfIn PDF document text
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/m8iqueqbou0ertisds73pvohs0/77436745572.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/novopu.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/a29251f528363a2a028de1beab99d4c8/42062032987.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/7ac19b5684acd87480b282a6ed248b55/getalesajizutuzeni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=whole+grain+bread+good+for+weight+lossPDF 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_off0000e165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE165 17724 bytes
SHA-256: 3137121f7ad237507a7e54c681b8f93d332bf7135b9ef223aae1e78013d457ff
font_01_sfnt_off00010f67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F67 10852 bytes
SHA-256: e58df3f54be8ba5cb0cf76145b35e5653c766f497aa3225a5532cd928a30efbc
font_02_sfnt_off0001283f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1283F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1