Malicious PDF — malware analysis report

Static analysis result for SHA-256 cae51c958a08e3b5…

MALICIOUS

PDF

79.7 KB Created: 2021-09-02 16:19:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6fe0668b81881fce5c3ec8d8d9cec9d9 SHA-1: 036d67e2b4cab1d9f90a121176f7ce083d4db5a4 SHA-256: cae51c958a08e3b537502c67c549ed30d913371e6c500ed685699e751c74381b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file functions as a link farm, containing numerous URLs that redirect to potentially malicious websites. The presence of multiple compromised CMS upload links and disposable hosting domains suggests an attempt to obscure the true destination and evade detection. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://pistant.ru/uplcv?utm_term=chennai+beach+to+chengalpattu+train+timings+pdf PDF link annotation
    • http://thevisionkharj.com/userfiles/files/24030669547.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16090257d4dd86---16774887660.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/1d4bfd68c483873403a7780a16e7921c/roparuvogufudevode.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/webuwatefelufon.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/24942555125.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/gogemelijefadegawepigus.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/9vtq5fntash0aqu6ubi9r17el3/wirepob.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/32275046621.pdfIn PDF document text
    • http://mankatomnclassof71.com/clients/e/e0/e0e8961458839910853a12af65841b27/File/36428710726.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161024dca492ee---vadizowixafozona.pdfIn PDF document text
    • http://ri-rm.ru/userfiles/file/poguloroxobukurifixexad.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/pagijotosivupezaz.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/fakafakevofemusadowadane.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/75939099887.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/semevoralewubenubakag.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/mexejolevadosudopuware.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/37feed525660a71054661575d40b52eb/854410299.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/88072786300.pdfIn PDF document text
    • http://chromavials.com/d/files/dunoje.pdfIn PDF document text
    • https://asiapharma.la/files/files/timifixawanipirerakulup.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609416f292d55---fedevodubavogadukis.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/e596e043cdffd1947758419924bb452e/wajowaporunejuloweneju.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/40b6276e9ae7ecb62c8ee9a2922b7137/bivete.pdfIn PDF document text
    • https://apotekatia.ba/fajlovi/sakiluborejetanux.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_off0000d361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD361 11336 bytes
SHA-256: 4227ffc8b28ecb96603bdeae86f7a26e435731857f2307e519fa9f6dfe4483e6
font_01_sfnt_off0000ed6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6F 16864 bytes
SHA-256: 67552a8f2c8705ec6d1f82955c4caf70822d10224d365a9442d95c0259a77c1e
font_02_sfnt_off000118e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1