Malicious PDF — malware analysis report

Static analysis result for SHA-256 902ed2b2d6c4e0ad…

MALICIOUS

PDF

80.2 KB Created: 2021-09-17 15:34:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8ad5e49558a4f2d0e5acc6d1dac63f38 SHA-1: 4bd45b56cf3bcc0051f6ff09226840508e83bfb0 SHA-256: 902ed2b2d6c4e0adf30ce0a7eb618077a6643f021b7ccad432bb83cffac59747
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing campaigns. No scripts were extracted, but the PDF structure itself facilitates the attack by hosting these malicious links.

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://oniceh.ru/uplcv?utm_term=what+to+mix+to+get+purple PDF link annotation
    • https://radekslodkiewicz.pl/files/file/72479158581.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/39183237690.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614464cbc5465---jarurosoxefokikezoburumo.pdfIn PDF document text
    • https://szemvidito.hu/sfwkr/feltoltesek/Images/Image/rojomakifudovutilopeli.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///xadalujobitosezen.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/60348238952.pdfIn PDF document text
    • http://naso10.com/userData/board/file/71616734947.pdfIn PDF document text
    • https://vnjhanoi.com/upload/files/padunovubetura.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/90907141413.pdfIn PDF document text
    • https://atlantidegattico.it/file/mofotewokogegu.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/161434e0cdfa5e---tutenasanevumujeguvosaw.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/butaf.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f98396338---89968790009.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16142f737c2ab6---16623237076.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210910_C1094D7806AA828C.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/58449853337.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/95721567553.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/kalezikape.pdfIn PDF document text
    • http://quinta.cl/upload/files/tanerujasetewol.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/gubetesemekub.pdfIn PDF document text
    • http://hairfibers24.com/upload/file/19748984841.pdfIn PDF document text
    • https://anandalaya.in/resources/file/pukim.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_off0000d42e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD42E 17980 bytes
SHA-256: fcc960ac3158e6521d528e4ca7d85b32c12e53fd2746e2ad9c0078bcd28be8f9
font_01_sfnt_off000102cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE6 10624 bytes
SHA-256: d6a35b6435561582b72091039218fc4b5b1aee0f0eedfda6f82b3c0b25f9df9b