Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2cbc3e75e151931…

MALICIOUS

PDF

70.1 KB Created: 2021-09-06 04:06:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d721cfc811cab4bb027ddee376e78f52 SHA-1: a596e9d8071e5be8ba79161b1de7159cad544682 SHA-256: d2cbc3e75e151931f422e8447d954e4bc68794e39688e19764a8f08019c10e79
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV heuristic strongly indicate this PDF is malicious. It functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories and other potentially malicious sites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://archism.ru/uplcv?utm_term=non+integrated+accounting+system+pdf PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a391cd981---sulijavizekurov.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6b4b6b2527---11394722872.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/55036781871.pdfIn PDF document text
    • http://tmacfashion.com/ckfinder/userfiles/files/muzaxobojuxikav.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/lubirafomaf.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/kimekaxijibemedulikuwol.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nikasa.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612e6509a075c---17700177362.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085c37588081---bokuzosapuvemazobadefomo.pdfIn PDF document text
    • https://ilcaminodaugo.it/file/26842458169.pdfIn PDF document text
    • https://finatwork.com/userfiles/file/mavakowo.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/40891915789.pdfIn PDF document text
    • http://salkim.com/userfiles/file/xemake.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/m4rtn0nsv2oa619i4u4b9u6u9h/jifaf.pdfIn PDF document text
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/luvonutima.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/72282892270.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/garob.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/jegawovupiruxir.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/87631637670.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/61660683493.pdfIn PDF document text
    • http://adamslakeband.org/userfiles/file/fajuguwabetam.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6fe135c1e7---55958204182.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_off0000b204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB204 11108 bytes
SHA-256: 2ee2ffa608d5c439be1d1448d07de41e0a8529af94d75a0552eb9e4bb967f484
font_01_sfnt_off0000cbc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC4 15616 bytes
SHA-256: f04fdf00c0baac098ab5fb809b251b0725b1feeba0fa83666d6e00c7518e8da0
font_02_sfnt_off0000f2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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