Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ba34cb92b1495c7…

MALICIOUS

PDF

73.3 KB Created: 2021-09-15 21:23:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a0b3afa8481bc84bdcc2c5e02f3a2be8 SHA-1: 6e80f23a3d9c565d15ba2e226f4e8a7e443a553a SHA-256: 7ba34cb92b1495c7c2afb2b275c638eab99e95a54667feef58590f0411e0a6c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a link farm with numerous URLs, some hosted on compromised CMS uploads and disposable domains, designed to redirect users. The presence of embedded URLs and the nature of the link farm suggest an attempt to lure users to external malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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 http://doktor-okonski.pl/uploadimg/file/jojanupojalepap.pdf In PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/0e74b15a18f6469f10cd56771fba367f/59750505748.pdfIn PDF document text
    • https://zzhqhi.com/d/files/98220882023.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/jopuwuzafonilug.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/sitilewemebokulapo.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/refopevupuvivebokedenow.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/b2b68b91b604c7b3620a16f1e744d3af/24946091182.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/pulefenorosobirojo.pdfIn PDF document text
    • https://istanajp2.com/contents/files/tosesirajetedasax.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/zojumijen.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/noxefafif.pdfIn PDF document text
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/lijebuvo.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/61988931804.pdfIn PDF document text
    • https://ms2oke.com/contents/files/nubalexinaluwanukomabita.pdfIn PDF document text
    • http://philipsphotographystudio.com/mowekopidevilopagof.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/ludas.pdfIn PDF document text
    • http://etnorom.hu/pictures/37110201045.pdfIn PDF document text
    • https://johanbjerke.se/userfiles/file/dogazepulekep.pdfIn PDF document text
    • http://tanphatinst.com/vietkiendo/upload/file/lopifekofuzo.pdfIn PDF document text
    • http://baove24h.org/upload/files/luzasolubo.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/nuzesotogo.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8fb9041c3---28831646578.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613f080e442b8---penenosedago.pdfIn PDF document text
    • http://novastal.pl/userfiles/file/wuseletudepozogunagul.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e07e615efb---87131814359.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/pizelamujefi.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/77296759873.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=fernbus+simulator+androidPDF 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_off0000ba82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD294 17324 bytes
SHA-256: 60a5056b9f5833993a317d17fb36c7822fb50a18bf47e9f314de40c772457353
font_02_sfnt_off0000ff86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF86 10628 bytes
SHA-256: 06c0f9915a10ca9a5e261ff619c0029288ddaf2768a21d316f59eab3e65d1155

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