Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a9ff8cc6c3921d5…

MALICIOUS

PDF

81.2 KB Created: 2021-09-13 17:55:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c9f5fb507620dbe42f7846ffbccc5940 SHA-1: 35a3d25f182b6285a215dcb8ee5c6c92c10e61f5 SHA-256: 4a9ff8cc6c3921d5b131898128197acb2d9f71b61bb76ace06f966aac66e671d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm directing users to multiple domains, many of which are hosted on compromised CMS upload directories or appear to be disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing sites. The presence of external URIs and link farms suggests an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f56bb8a76---24824577273.pdf In PDF document text
    • http://sportschoolindex.nl/images/uploads/vajonixarufit.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/98246298865.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/jagejajigizuvamovotasel.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/46984425866.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1613060e37aa3e---17336885080.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/zefidewanogudeloferub.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/84095453924.pdfIn PDF document text
    • http://sintniklaas.kinderopvangpimpeloentje.be/ckfinder/userfiles/files/fowafofomupadaladud.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/70052362710.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/kobetidajufeloj.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/lointrol9p1brrdee174tb29j5/mogimubovokuv.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/85636123396.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/woriliwowamonerezupake.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/bapogewogufunufunev.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/26082299521.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/89760508611.pdfIn PDF document text
    • http://sunpix.ru/img/lib/file/41412168125.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/53631044989.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/9a2721bbebf30bccbe32167f0a2e3e46/nuwasadawag.pdfIn PDF document text
    • https://best-label.com/upload/files/38413574923.pdfIn PDF document text
    • http://selidbe-beograd.info/files/gekegapadasovenevid.pdfIn PDF document text
    • https://sayurhijau.com/contents/files/87747532393.pdfIn PDF document text
    • http://jayeonrak.com/upfile_editor/2021/files/volemuf.pdfIn PDF document text
    • http://mywayrtk.org/userfiles/file/fepexosejaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=android+kodi+buildsPDF 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_off0000da86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA86 17944 bytes
SHA-256: a162ba3d391f6abc2fb3a12a0516dbcb11502dc421ed2da0d93c58f313cc840d
font_01_sfnt_off000108ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C2 10160 bytes
SHA-256: 2b6098a659613905b02c8f2628babfb244c3f6f77afc6a17ae61e9fb4fde9c17

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