Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6f2f1c65d4195f5…

MALICIOUS

PDF

83.3 KB Created: 2021-09-02 23:07:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 33f8beeabe460b1ca12e8784a337fe8a SHA-1: 0fb97ceec62b47cd8c674044bf2c3b0ff18f58f3 SHA-256: c6f2f1c65d4195f5dc28d2c71e8fe493bf9feda1d66555539dd44499208d08b8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to a variety of domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this PDF is a link farm designed to redirect users, likely for phishing or malware delivery. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://huntic.ru/uplcv?utm_term=masto+wire+rope+lubricator+pdf PDF link annotation
    • http://www.rannatennis.ee/data/upfiles/files/37217124843.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/pke9noqos46bqcjo4q0v2m6gor/kafutalobexulovagasaku.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/25275053952.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/t1narbdpghp18pjk0hfn361uh3/12175435080.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/regisuril.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/30521885652.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/95346144018.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbfb7d7571---xizazunot.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/petosodemiwulifakupibiko.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/30614168868.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16084a0847156b---32504691448.pdfIn PDF document text
    • http://tpt.taipei/asset/uploads/files/sijuwiwesifudaxeritoxobuj.pdfIn PDF document text
    • http://haniltm.kr/upfiles/editor/files/migutuzazed.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/87313729357.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/v1ggleaott3vqim1nimd5c9qmu/66720607789.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/ginulidurubaroxutol.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160e81c0d88c73---pazefavekamupox.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa52235b2c---gugisebitufivavelumujit.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c888ec34b2e---guboxugikodonosixevi.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/dodekorejogiwa.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609893ee5549e---nelutirumejarevovadoke.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/suzitixanebisejifizutot.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/47645155747.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/8cb2e8107eb0572f94fb92b83382cd97/28670224448.pdfIn PDF document text
    • 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_off0000de0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0A 10828 bytes
SHA-256: acabcbd6d32d3a63a256cb681ee101e690ac41cd70c6cfa247e46e594ea6e363
font_01_sfnt_off0000f6fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F10 18844 bytes
SHA-256: dc9936856b14f996df3e27e5153b060b64d34ec50432cdb06b21cd0bc42056ee