Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fb63bdda6726041…

MALICIOUS

PDF

82.4 KB Created: 2021-09-09 18:17:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 47adb6e05e6e28df6b12f4f495b4ed50 SHA-1: a9e6fb47a2cb6b13841b0cbeb10b3d058aae4ece SHA-256: 5fb63bdda672604163fe303d31de5eafb5bd70d955cf1b10538515e3ad282665
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as phishing malware by ClamAV and flagged by an ML classifier. It contains a link farm with numerous URLs pointing to potentially compromised websites, suggesting an attempt to lure users to malicious content. The presence of multiple external URIs and a link farm heuristic indicates a phishing or redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://alwaysthesame.pt/site/upload/file/wuxudadopenepajanuzoxe.pdf In PDF document text
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/fufulegezapizitazetegipi.pdfIn PDF document text
    • http://xn--2e0b30g3uq7pay7m.com/upload/fckeditor/file/zazukuxumaxeti.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/jopesiresawigabopexoruj.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/161379eb4d831b---61035623572.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/66690170187.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/53307320767.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/lunepobekosibor.pdfIn PDF document text
    • http://klaaswester.nl/img/file/kimemivabonineguvutamuru.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/fisimevatogesofafezesuj.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/38323685700.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/fikozilifesimepubomujul.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613005592e40e---poponusi.pdfIn PDF document text
    • http://yingtailong.com/upload/file/210901231205680980kr0mxxu5tl35.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/47590541152.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/15d0j8k443om7hvr0hrq14en54/pijitefage.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/loralekekikukifevi.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/12800182567.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377f1ad4808---xowuwakut.pdfIn PDF document text
    • http://annabarons.lv/files/files/derokurif.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/55557921300.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/rijubaxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=dragon+quest+8+android+cheatsPDF 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_off0000dd29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD29 17136 bytes
SHA-256: bb1b790fd1b38a1afc932dc3b510877f01fc5817412ba5fa8b26bcbd67cadb46
font_01_sfnt_off00010985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10985 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001219c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1219C 11060 bytes
SHA-256: c54f0105c3be2e665876f28b6d305413eebbf10d9ebd89ff8f690e81a92cf8f3