Malicious PDF — malware analysis report

Static analysis result for SHA-256 50c0a3b88c1c3a9a…

MALICIOUS

PDF

71.6 KB Created: 2021-09-16 15:24:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d4a54973bfc73ff888a50135e5bd6b82 SHA-1: 843d17bfa3c3bd9ecc3b138c4f7607453fa300b4 SHA-256: 50c0a3b88c1c3a9ae6ca3ec44992155de63394dfab065fdec1114003347a54ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external resources, many of which are hosted on disposable or potentially compromised domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a pattern of using link farms for distribution. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ketchas.ru/uplcv?utm_term=theft+auto+vice+city+apk+download PDF link annotation
    • http://floramarble.com/uploads/4285409954.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210909201055431.pdfIn PDF document text
    • http://samtekelektrik.com/files/jupukufilugigunerof.pdfIn PDF document text
    • http://preiswerte-unterkunft-papenburg.de/mediapool/12512722767.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/vjh49mtf4n772mo4qi6267flhs/kimudawizumaza.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/4943707993.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/38067383415.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/24358590928.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/kurisojigitanemozubud.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/31721318155.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/69545861866.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/wunigim.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/botimafad.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161392c1405f9b---pexazur.pdfIn PDF document text
    • http://96stone.ru/userfiles/file/kekimoludegogegakasuv.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/23424294195.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/xinipijexazaz.pdfIn PDF document text
    • http://friulanamarmi.it/images/file/mefodeletug.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/41838247490.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/tobuj.pdfIn PDF document text
    • https://demo.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/42980340655.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/xirositelawebigaxewob.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408ef381986---pujusexipowaxuvodaper.pdfIn PDF document text
    • http://tubelessons.net/cms_images/file/besirelutediburupan.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_off0000b6a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6A8 15800 bytes
SHA-256: c4e6e05323a8bdfefaab96a9c657d0ec6ea759ca7bacfdbd4e65c293992e2933
font_01_sfnt_off0000df31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF31 10872 bytes
SHA-256: 5a2b9e6541fe806b0cb19b88a10dac2b333f1ee0f1561d26ef9d2f8e906b9868
font_02_sfnt_off0000f85b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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