Malicious PDF — malware analysis report

Static analysis result for SHA-256 23448fef16ec35c4…

MALICIOUS

PDF

81.8 KB Created: 2021-08-21 05:22:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 482d61485a44c6cd0d2e8929374af8a2 SHA-1: 3ea7baf5bc9acb8ef07bb9ff138866c9b3a94118 SHA-256: 23448fef16ec35c44a576c00a8f5972aa2f13272ad91f563032b66e051fb4f77
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm designed to obscure the true malicious intent. The ML classifier and ClamAV detection strongly indicate malicious content, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://noavarservice.com/ckfinder/userfiles/files/nidagabivizu.pdf In PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/229f7b0259ce537e5ccc2674f2220724/59911016048.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/tafoxetidizobopajadikex.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/vfnuc20juk4gmvcspmqou564o5/72052914899.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3712ef2aa---74704402885.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/38658503124.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/55eccc5356924c832800389e7a723229/jimesabatasimew.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c19acf52cd1---rebaremofiwabalomamivug.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160843206908e5---vegikin.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608415159cfc4---42152933684.pdfIn PDF document text
    • http://demkapi.com/resimler/files/feleka.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf1448dd4dc---zutin.pdfIn PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/16954309139.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/1ldio2dp4f1ml3hcga5rdeksgd/luvobalun.pdfIn PDF document text
    • https://cmoretv.com/userfiles/fumovosu.pdfIn PDF document text
    • http://kco.su/userfiles/file/72206284100.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/togoxunukemofopu.pdfIn PDF document text
    • https://pasarangroup1.com/contents//files/1932636867.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160772831e3128---zanuzanaderaguluva.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/665658648e7709e1494de9d687c9ba60/diwixerate.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/15405932400.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/wulotutusexid.pdfIn PDF document text
    • https://sinarwaja.com/account/files/53197981627.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=gta+vice+city+cheats+apk+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_off0000dc0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF424 11112 bytes
SHA-256: d68db807c287039ad78213bf19bdc19dc3ba8eb8a53709748d80f0ce59eb8f4f
font_02_sfnt_off00010e1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1F 16692 bytes
SHA-256: 4c7ae70e656c1828dff91804eb2c6ff61040f0ece56d8a2f4895df1d4bb04378

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