Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c9e2048eea1e10e…

MALICIOUS

PDF

81.7 KB Created: 2021-09-17 03:23:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3b66446efbbe3dba2feca33db6726261 SHA-1: abcec707d33c3f4d4b29a275b7b56337e4ca9508 SHA-256: 7c9e2048eea1e10e266b9d7d1ec53cae9019128988ca7a9c2f7e9a001171b83a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a phishing or redirection campaign. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting an attempt to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://koratspring.com/upload/file/fuxaviruti.pdf In PDF document text
    • http://primaria-ciocirlia.ro/media/file/sukedazorelogijisuju.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/11562691899.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/53049927478.pdfIn PDF document text
    • http://partnercable.com/files/renubebovuturul.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/pulugodidemuguwow.pdfIn PDF document text
    • http://bio-scan.com/userfiles/file/jugogofagarirofigiban.pdfIn PDF document text
    • http://honeystraw.com/uploadfiles/file/nuwimika.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161384f51c1d15---rifuginaziv.pdfIn PDF document text
    • http://dopuskvsro.ru/UserFiles/21316599441.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130628410b17---bupiwabe.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/19438900152.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/3600221046.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/wezija.pdfIn PDF document text
    • https://cahayaapi1.com/contents/files/mebizito.pdfIn PDF document text
    • http://www.facyt.com.ar/ckfinder/userfiles/files/pujawexe.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/xipekefelet.pdfIn PDF document text
    • http://houtackers.nl/userfiles/file/92806705071.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/70560490493.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/xovemorimolaboluru.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/44291741019.pdfIn PDF document text
    • http://steinbach.casawell.tw/userfiles/file/60429116095.pdfIn PDF document text
    • http://hdg-gmuend.de/userfiles/files/59825368750.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/8558f9329a4043800578f0eb7cbcbc6d/tinadisitakusimo.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/66181094351.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/buwukevuzabejinew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=the+theme+of+the+poem+ozymandiasPDF 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_off0000db31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB31 17652 bytes
SHA-256: 0897a926ecdf87298028e7a06629b38d93fd6845b9008086fd4645890f83b5a8
font_01_sfnt_off000108a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B8 10752 bytes
SHA-256: 46cddb12d5355bfbef4bae9fe90de7e7a64ea1c19ceb3684776d5643d1b0097e

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