Malicious PDF — malware analysis report

Static analysis result for SHA-256 da8d5566bb1e6d30…

MALICIOUS

PDF

90.4 KB Created: 2021-09-05 23:25:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 3f3e732d7df8d8cb1d4b29fff7712b0c SHA-1: e47dea4d8378ce15f661234f67c8353a5e28372c SHA-256: da8d5566bb1e6d30ecdb5d1e1733bfac8b04b74281a1680e435d2f8374eef47b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://catamma.ru/uplcv?utm_term=alter+ego+b1+guide+p%C3%A9dagogique+pdf+gratuit PDF link annotation
    • https://turismopontevedra.com/ckfinder/userfiles/files/22718374644.pdfIn PDF document text
    • http://spoilersmensgolfclub.com/clients/865201/File/mazuropusuwipori.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/11442948481.pdfIn PDF document text
    • https://digireg.pl/upload/vobagise.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/72754197828.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/woteviwamovupuluvogujopud.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/96088078894.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f583491d71---roxetipapuzuni.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-6-30/20210630070730415920.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078a12173dd5---62740720509.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/e7789cee7fdf409731bb0c2cb9014191/mitemulag.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d3b7b380563---surulukumojupuraja.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/a7ddd8f79879b08cacf6c5da8cfe335b/85815800297.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/pikemoxofojaxiwogojubu.pdfIn PDF document text
    • https://carlojans.com/cms/file/betefizitixer.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/25765686710.pdfIn PDF document text
    • http://33podarka.ru/pictures/files/81591844344.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc555198cf---ximaselobikixabilol.pdfIn PDF document text
    • http://www.motorradfreunde-toggenburg.ch/up/files/31570956135.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/37392450587.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/papujejigo.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/88f3551fb37d28408cb84e8279407b20/4913163829.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103018d2a87c---2197645071.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/cd7c5d505be9a0bf55408ab45c3c5449/17399933328.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_off0000ed2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2F 23424 bytes
SHA-256: 920c6d9fb47a024b3a7417338774b7c731b96d03a31199ee28515bb4ec9ada2a
font_01_sfnt_off00012868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12868 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001407f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1407F 10972 bytes
SHA-256: ac20935ae4fc7d91263c1fbae8322f6bb2ed05bbae6797577bb158de72320f84

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