Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca3750421763ea38…

MALICIOUS

PDF

84.1 KB Created: 2021-09-23 12:32:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1efb338d1d4f48a16f4289a487ad334a SHA-1: ac3f1998bc03989bc93e2a3dfddf5583e15b366d SHA-256: ca3750421763ea3850cad3aeaf58702073e30f1269c65ca0637735030a9ebd70
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier with high confidence. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the PDF structure indicate it's intended to lead users to malicious external content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://oniceh.ru/uplcv?utm_term=screen+landscape+android PDF link annotation
    • http://joltiy.ru/uploads/files/37703306182.pdfIn PDF document text
    • https://hkpefa.org/editor_upload/file/39105266902.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149964776945---75216473855.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/renexiwapusukin.pdfIn PDF document text
    • http://dd-eng.com/files/files/sidanidavanusapa.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021091216021473499.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f511764c1a---burasijagudidodegewexanez.pdfIn PDF document text
    • http://wamer.org/userfiles/file/toxopemorafojeni.pdfIn PDF document text
    • http://tfforming.ru/d/files/10148340712.pdfIn PDF document text
    • http://myepres.com/HotelEstimator/userfiles/file/kefununefitebu.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/81400574200.pdfIn PDF document text
    • https://matharu.ae/userfiles/file/ruzorevev.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/wolatirimuvusefawoxip.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142a325e091a---60113226673.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202109200407183484.pdfIn PDF document text
    • https://s-h.cc/uploads/files/202109221056014256.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/sazaxaxufo.pdfIn PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/69883226208.pdfIn PDF document text
    • https://equipelec.fr/ckfinder/userfiles/files/17625928482.pdfIn PDF document text
    • https://jagominum.com/contents/files/64517501464.pdfIn PDF document text
    • https://777mto.com/contents/files/mijejurobosasik.pdfIn PDF document text
    • http://gocoachfox.com/userfiles/file/22057377196.pdfIn PDF document text
    • http://sgrdinstitutionspandher.org/sgrd/userfiles/file/lutimujazakurujurelipove.pdfIn PDF document text
    • https://haruhonpo.com/upload/haruhonpo/files/joribudubopigus.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_off0000e3fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FB 18172 bytes
SHA-256: 0f478ad585ea7422a395ba5e8e17cec0f589eeb724857cd0f7ea71985369ab0c
font_01_sfnt_off00011269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11269 10484 bytes
SHA-256: 472d5325da6e70b368b2ee6d8b980281227735a352aed83777ec994112448d16
font_02_sfnt_off00012a3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1