Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ce9fd244284376e…

MALICIOUS

PDF

81.0 KB Created: 2021-09-08 11:55:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 52bdb46f9f9897466ab4e1003bd636a1 SHA-1: e6e222f799cb8409ca289e5ca17f74ccef926ac7 SHA-256: 3ce9fd244284376e1471d0c95e61fdd09657f980f536ccbcef82a20830d085d4
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to other PDF files hosted on potentially compromised websites. The presence of multiple external URIs and link farm heuristics suggests a phishing or malware distribution scheme, where users are lured to click on links that lead to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://lnaixi.com/userfiles/file/20210708072517_454730118.pdf In PDF document text
    • https://calmoinc.com/upload/editor/file/45810394462.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/dapipegipajefu.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/86252194860.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/tejotu.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b0bd0c7bae8---34794893373.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/6698fu7grldumvrcdnfrq77nsk/xeribagatoworarimuleda.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210721141611_89603850.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2e1fa60bb---11073970209.pdfIn PDF document text
    • https://pasarangroup2.com/contents//files/mifiludosivo.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/67521120822.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/jemojegubuwebirovux.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606ceec747724---jiwofuwun.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160afa702c6f6a---87248444762.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160762496e9c80---xefefi.pdfIn PDF document text
    • http://jump360.co/upload/files/20210620132520.pdfIn PDF document text
    • http://fairfresh.net/assets/admin/ckeditorimage/files/53089512506.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/kazotobudol.pdfIn PDF document text
    • https://tonitomov.com/picture/file/65866085052.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/pagofozivusikik.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/1a615b70f6f5aed2de89aa9488fbe8cb/zanin.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909d0b55628---punesu.pdfIn PDF document text
    • http://esejsc.com/upload/files/77122777012.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/8756867088.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=tarasankar+bandyopadhyay+radha+pdf+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_off0000da82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA82 10668 bytes
SHA-256: b289ee0f319d31f52a65870b8c514d60d8672088e7760b9a05810aa5fa422945
font_01_sfnt_off0000f2b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B1 16616 bytes
SHA-256: 1c30ed186766d28bb1aff9752491da00faf658abd020015009546a9a25ccfc8d
font_02_sfnt_off00011da3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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