Malicious PDF — malware analysis report

Static analysis result for SHA-256 08dad76198d906df…

MALICIOUS

PDF

89.5 KB Created: 2021-06-18 18:55:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 820ea8b6793249320454b7e33aad32e6 SHA-1: b6840c16e49e1219323ee5410420f77f439ee26c SHA-256: 08dad76198d906df7893772dbaf4d50740be7aae32e64de1e3d93376062d8ef7
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://uclerbaklava.com/resources/file/ronegamalowizuvax.pdf In PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160a6140d0da4e---komapi.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca084b70b5---32805431635.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a47de642524---repidavowezazitoma.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160766c30665e8---wivuwoxeri.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/norodefuz.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a880c06ae96---nekelo.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160821f473d59d---vanezategazubelibo.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607411e118703---69941725780.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/jofarewuwikivu.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609e33cc85687---murubadasepedorevijufuwo.pdfIn PDF document text
    • http://landpas.pl/upload/file/82120506606.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/narulaxusinemadagakapul.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/d9602452f8e10271ad71e69cabc35289/22955777879.pdfIn PDF document text
    • http://piau-po21inn.com/CKEdit/upload/files/8550871035.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210517105650.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=private+browser+with+adblock+apk+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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e30b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30B 2964 bytes
SHA-256: 7c5d88854bfdfde11679be7586a65994ff8ef6b173dc7cc3698a02cfb11f1027
font_01_sfnt_off0000ed9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9B 5520 bytes
SHA-256: 5271720c68709b7c5a847da9d4905c6d1482601b8b097c4c5c5bb7f30107c393
font_02_sfnt_off0001005e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005E 4372 bytes
SHA-256: be6bf16113f1bb07d5bdbc2ce488f3b2f6323b40b1e4ceb1f5eb8f4636d6d585
font_03_sfnt_off00011159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11159 11492 bytes
SHA-256: 169375222c875590c13382e5c1c2ca035279d6af3c1b15a56c54b56f6065da6a
font_04_sfnt_off000138b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138B3 16728 bytes
SHA-256: c2184d214a1d43620d6eaca406cb46454f71195c713980bf2eaa440d43698a1f
font_05_sfnt_off00014ff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FF0 1736 bytes
SHA-256: 5095ccdfdd328c3f25b1766e9c65bca58fa839170fcb9f3db3c20e130d955aff

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