Malicious PDF — malware analysis report

Static analysis result for SHA-256 791438ace28de7f1…

MALICIOUS

PDF

80.7 KB Created: 2021-09-03 23:00:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 25043d5be874e69e7ebdc5878657a98b SHA-1: 94624c8a89fa0378cb22360d7bd6f95c3ca4dcd8 SHA-256: 791438ace28de7f1117555d807085d1806335348950e9ccfd6d560ce9afebf93
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a phishing or scam campaign. The presence of the 'utm_term=becoming+better+programmer+pdf' parameter in one URL indicates a lure to attract users interested in programming resources. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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=becoming+better+programmer+pdf PDF link annotation
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/2728e3a0079cec3702ac8481e418474b/dibinugikopotulijikibise.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/xafatubewovuwum.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160f1a3c8ae88d---9345176232.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/xefobimumurojujex.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/69357496719.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/7jboc26pm4d12vjeushvddf2lt/madizukafar.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/48f0c60cebc6a319f5f8304cfa02600d/sanukesizosezuvefis.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/nerexavafubemepoluzute.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609c26d15b9d7---kemarozodikusu.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/23977342446.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/5v041cn97ls2ii6foifq8l3ned/luzituxobamuxeriguma.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/jusum.pdfIn PDF document text
    • http://zonwering-belgie.nl/ckfinder/userfiles/files/zafomepakivoweg.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/56220461872.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/8850925983.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/23753653414.pdfIn PDF document text
    • http://fdscience.com/UPFILE/userfiles/files/37486715662.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/1926335343612abe4c7c08a.pdfIn PDF document text
    • http://haworthclassof73.com/clients/73472/File/17144741296.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210808_213217.pdfIn PDF document text
    • http://mankatomnclassof71.com/clients/e/e0/e0e8961458839910853a12af65841b27/File/51031777352.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/90028ce05c6034e0a84498a70d0df51a/supuneziduxuvatotebamezuj.pdfIn PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/76730775448.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/kl0gj10hi9mi4hg68sq758qj50/zakufe.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/20269245644.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_off0000d72e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF40 17584 bytes
SHA-256: 0abf623fbe52018836d3035098a6bdaebe1b06c19e4aa24a9ff3add59aedf0d3
font_02_sfnt_off00011c7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7B 10940 bytes
SHA-256: 0fb87d86065a96de838460e5e8eedb485ab2e8f65ff3e3d266671a30320a7b1f

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