Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aae055779f42df3…

MALICIOUS

PDF

83.3 KB Created: 2021-09-21 23:38:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 58d34a17ff775d20291e682100d97736 SHA-1: be186ebcd6056f8f5a268946432eb1a8941dded4 SHA-256: 9aae055779f42df326bbac033c13dfeb5c81c44b00272296e256c3a354c4c830
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the PDF structure and embedded URLs point towards a social engineering attack.

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://crewmak.ru/uplcv?utm_term=hogatoga+free+wifi+password+download PDF link annotation
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a583a3005---rozexuzokowiwopovopos.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/kigelazanevubusikiluv.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/sififijabomoporejolapoz.pdfIn PDF document text
    • http://darstin.com/userfiles/files/65093274794.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161310130af108---mupufifunabidofeguwedo.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/weguwojexekirajap.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/bb9af4565c8330d4aeac0732365ccf37/badunazokejalegewidoti.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/ccsccslrd368eu753bf70p0mof/4898412070.pdfIn PDF document text
    • http://ocvitlucky.com/vietkiendo/upload/file/wubemewawijizodujaxurun.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/lvso688q4cfcl6rnf5of5000m1/kupel.pdfIn PDF document text
    • http://www.mmalappeenranta.com/tiedostot/files/zapuraxupam.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/81003594125.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/toxowilazovojemuna.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/zopomiwojur.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/wujowedobemal.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/64039868778.pdfIn PDF document text
    • https://csmgh.net/pevron/www/img/file/78000133450.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/pokodolumagopirirununu.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/ca9b6e63a5180dfa59378491d2adbc68/zalajezunexikibikamute.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/vekofifegivesiwimepipuk.pdfIn PDF document text
    • http://milkyway-vn.com/upload/files/29912841007.pdfIn PDF document text
    • http://ptichile.cl/userfiles/file/45287046991.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/vorubizigo.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/94dc6bd518d714dab3c550920ec558de/mumerovonikobek.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_off0000de9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9D 18016 bytes
SHA-256: 7837a5d71013db8ba437b7da1ac1b0f900394a139795df31a56b577a6f91420a
font_01_sfnt_off00010d13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D13 10748 bytes
SHA-256: e73d4b1708476700d95c24309dca2c48ab39f59e3c3bd962cf2a8cb43cc253d2
font_02_sfnt_off000125be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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