Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccfac58052d2724e…

MALICIOUS

PDF

108.2 KB Created: 2021-07-26 06:41:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 480130d91bf101ffda9733126bb88db1 SHA-1: d4a375d6564dd4e5709979772c3d65f85b99c014 SHA-256: ccfac58052d2724eb09a4ebe9291422b0779e78c6f53eef3133379664c9d3ed6
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host and distribute second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://goldenteriyaki.com/uploads/files/58990359078.pdf In PDF document text
    • http://enerjipiyasalarizirvesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1f088bdca---19381388861.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e237bae5a---pobig.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/vogugasunebotevufizujuza.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/03a8712f43f1dd40c6122ea1279421a5/xejidurunofepisozonifoda.pdfIn PDF document text
    • https://ka-base.no/images_content/file/totitokenikoxen.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f813414cf6---37077970736.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/34459526068.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/9345824329.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/ujhb943o1vf89h0c6sqfv1737m/46082771727.pdfIn PDF document text
    • https://pasarantogelsatu.com/contents//files/wuvopadedizadaviviv.pdfIn PDF document text
    • http://fsanaq.com/upload/file/210619220513767626bbphuy9fdlmy.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/77074213421.pdfIn PDF document text
    • http://thietbiotoviet.com/Images_upload/files/foxesumovogesubaxirubus.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/17915275efe7a82ac59a1346234cd9c2/64403365182.pdfIn PDF document text
    • https://zzwgjx.com/d/files/limekuvenakoforilexesi.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/xinidaxujigosoz.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8d79500c1---85096215525.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16098403c5dfd4---fenonomuduguzupitupewu.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/smffq4dtrcm5qms3q122l376l3/34430031765.pdfIn PDF document text
    • http://cobbpaynefamilyreunion.com/clients/862770/File/70647137659.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607c37e3097c0---55946175698.pdfIn PDF document text
    • http://eshop-kocicinadeje.cz/files/file/43559634550.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/oh44pfpm61f42itvn6cajdc6v6/14265170912.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/64499295070.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+to+help+with+depersonalisationPDF link annotation
    • 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_off0001429f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1429F 19312 bytes
SHA-256: 7bb12a31202e7a7fd026d95e6ea468338f4b25e7256cd9fc6f970bab7e121817
font_01_sfnt_off000172d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172D5 10568 bytes
SHA-256: 20acca1fd9fd35be38821dfc63da9d075c03551efe11b64d1e23165754c5d69e
font_02_sfnt_off00018ae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18AE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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