Malicious PDF — malware analysis report

Static analysis result for SHA-256 c66a25e83443b1a5…

MALICIOUS

PDF

81.5 KB Created: 2021-08-20 16:13:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1b2704a4c62599c359f87195d782174e SHA-1: 0f3f3f0f31d37a8fdf18fe112fe369ec0bf3e45b SHA-256: c66a25e83443b1a5aee6748c52789471c248971e39d0e5563645288f6469f121
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://crysiq.ru/uplcv?utm_term=what+are+some+of+your+strengths+and+weaknesses PDF link annotation
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc515cadacd---1282140474.pdfIn PDF document text
    • http://lindendirect.com/tempimg/file/51511082316.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/oeoms4s40mmchticru5cp2h09e/jowodexek.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/65601685840.pdfIn PDF document text
    • https://thehero88vip.com/ckfinder/images_store/files/dozixuzaxopijalom.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/bipufojozigog.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/k8qf8ld7a5nkijj94l1a5cmr0j/40528018174.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/57915776116.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/unm6jhl279q40jhrep3gvpmuh4/luzuvurafomakoxuz.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b33efc02ab---19122436993.pdfIn PDF document text
    • http://sam-global.info/files/file/39113361907.pdfIn PDF document text
    • https://przygodanaukrainie.pl/admin/ckfinder/userfiles/files/4115044369.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/buwobadepasiseleno.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d09a55f76f---72878369167.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/39739374245.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/sezivizimanefelukaxivupar.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/nedefis.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/44337357587.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/bdc35624f02f481489ea75d06080fdd3/40785669336.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/puwosoduvalotilikawufeb.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/411b214fe87cf374cc13d2cd14c8c1b4/37324787870.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/88f0a35dd028416449f7531e553d336c/89041443271.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_off0000dbd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD3 11048 bytes
SHA-256: a1ea0f368ba9490aaf737ec29cccc49b9f7f8bbed10ce1f0db144d4db0710c20
font_01_sfnt_off0000f54c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54C 16504 bytes
SHA-256: 62c8ae477be9825aa27bf145f1bbeb7626188cb7541f11d855da9e87f912183f
font_02_sfnt_off00012012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12012 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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