Malicious PDF — malware analysis report

Static analysis result for SHA-256 c02f092bc77e5d8e…

MALICIOUS

PDF

108.4 KB Created: 2021-09-07 15:25:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2f077a0b00d6a96659ae78184760d54d SHA-1: 25eb0914295b51dcd9e20b259c98c967a65add75 SHA-256: c02f092bc77e5d8e65c2157dea18bbcb92703a12ebbf5f467d334dcc5fcb755b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The PDF structure and embedded links are indicative of a link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://inwebjor.ru/uplcv?utm_term=cuidados+de+enfermeria+en+el+puerperio+quirurgico+pdf PDF link annotation
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/826917999cab15aca0f11266d90180ac/laridabupaxixalumevunilaf.pdfIn PDF document text
    • https://morabia.fi/images/file/bopolalo.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16099cbbc6dcc0---javajonewu.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16129fa326534b---gilexunopoxuxonujojipedu.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/70712395987.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/9c9ceb8c316a3824196a905bb3f09717/67352677899.pdfIn PDF document text
    • http://focostrade.com/files/20210705064307.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/60607738314.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/9002774925.pdfIn PDF document text
    • http://alwaditrading.com/userfiles/files/jedujapofanasololokeguwor.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf63dc1948---21321049732.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/77149f238e943dfaabaee8114db48156/1466042730.pdfIn PDF document text
    • http://isisthailand.org/file_media/file_image/file/kivewogukujewugopeva.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/33229601259.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/gerufa.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/95018018980.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/fixelusuliwobenajugiju.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/34fb7ddb7ab265695c381da3d01fcbfe/siwupe.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/7066uhggsd1dm1c1b48rpv4g5q/29388717342.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/66631054183.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/22092192394.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/zolavow.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0001885c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1885C 17376 bytes
SHA-256: 0092aa814a94e70527098b8927ff0c8f3f1d8feeb3b16206dc6d16ff9c499fb4
font_00_sfnt_off00012446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12446 19672 bytes
SHA-256: ee6bb978987c19dfba85e10287910fd3a01191ce687b1896583d2e10cc7ea102
font_01_sfnt_off000156ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156CA 11140 bytes
SHA-256: 434dbe348e1790f3052c53bf019df37ff076bc39de94b7d419a7bab31f8da072
font_02_sfnt_off0001704b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1704B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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