Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cbefc6f8f2cf8a5…

MALICIOUS

PDF

86.1 KB Created: 2021-07-10 00:48:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2ac71bdc0420de703787d09b31da3120 SHA-1: 9a941119bc678776466101e7a9363d75cff1e7b1 SHA-256: 2cbefc6f8f2cf8a57a50e1b6104b182fbd03755370dc3355eef3b584c81722b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/4kfcp726b2hv8upufnuuqr9iva/vofudunapel.pdf In PDF document text
    • http://internationalnetworksolutions.net/files/musotivufa.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/9907191771.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b9065dffd---sirujonazodewatuta.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/eigdovctij8cn5uhuk5f723quq/remawajawebedimexekife.pdfIn PDF document text
    • http://malifer.hu/upload/file/43995628723.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/77635deea0c116a5f2bf03060926823d/farifevo.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/56191dbeb1ddfc72347c1dd66ccd1432/tezesosegeveretexenepa.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/loxuziwifiduwulejojakux.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/olr5iqem0sj79plji1uec6bg70/julatusupuvuvowotefazuxe.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/40662855869.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f76d5a577---95078472703.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/cba99jcqlvlk9ksmc3dalqrij1/gugapiv.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/1432440135.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/4ps4k6llaten70odesti988r95/wonolaxaborixolexuvebex.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/zunewaxexoxuxizelor.pdfIn PDF document text
    • http://ladue62.com/clients/2/2d/2d0487a90c18d3a1b3df44839405a665/File/56875345752.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/000a71147f90cbce0a845661d1afff4b/87846577332.pdfIn PDF document text
    • https://agatanorek.com/files/file/23625135743.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f0a47c587---24328696506.pdfIn PDF document text
    • https://studiorampinelli.com/file/gufeturoduzonoraw.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/gejiwesijisebevifozasuta.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afcd9015d0b---62075855235.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/nilemikodepafelo.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/47588139346.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/61738923346.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=mov+to+mp4+converter+free+downloadPDF 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_off0000ed12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10529 10744 bytes
SHA-256: 83e5b88def984ef9ee2ecc73ab418181bdb8c3f7fb5f447eec7252b9c2ad0b98
font_02_sfnt_off00011df4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF4 17168 bytes
SHA-256: 6ce7ace6f042cc95b4940080c81efc084d162fd726539597957578dcf659cceb