Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb3e84e3161dc0e5…

MALICIOUS

PDF

84.5 KB Created: 2021-09-03 19:47:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8029cb77d1abe09d47e665af050b7ef1 SHA-1: d415884b1b2a307868c7634cebe28aff5f454b5d SHA-256: fb3e84e3161dc0e5c76bcfa9d18a3041a7d92444e512fe274acedd0203163ebd
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lure users to malicious websites for phishing or malware delivery.

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 https://philabc.ru/uplcv?utm_term=american+sign+language+dictionary+pdf+download PDF link annotation
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/42d58042bbefa00bf1c86569de51f034/mupepajemaxitot.pdfIn PDF document text
    • http://yocarbroker.com/upload/ckfinder/files/33072409473.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210718131456_a6r5ir.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/53982362330.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa42a744ff6---dipanoxerulusabetedeza.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd696d467c---41186467118.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/85611365943.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/95095600239.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/58d3251f5272922ad6c0feca0be2558e/fuwesadujugizibexodu.pdfIn PDF document text
    • http://thietbianninh188.com/uploads/files/puforekudesibovij.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/givewilavabububaxab.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///66430358858.pdfIn PDF document text
    • https://theurbanthinktank.com/files/zupelimoluloki.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160748423418fc---taxoxatonazomasexofisadiz.pdfIn PDF document text
    • https://coil.hk/upload/files/77771802295.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/5529abb66ce6f4cd8d889bc5f94772ef/bobapavafefeb.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd7d5c153c---70677531386.pdfIn PDF document text
    • http://cga82.com/admin/File/rolozemibexedakekon.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/66047006775.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16076b24250e7a---winiviwerebegedujoduxejad.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/jaxedinomijutupi.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/7287336805.pdfIn PDF document text
    • https://tanthuantelecom.com/upload/fck/file/29171619341.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/73173387604.pdfIn PDF document text
    • 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_off0000e63c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63C 16732 bytes
SHA-256: 41753d8de25a35750207a519165123a3d1532392f0d631cddb5151beeb9e36da
font_01_sfnt_off0001115d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115D 11244 bytes
SHA-256: 1217112a85e5a3bc923ea489b71f7d6847385b9ebd1ab4109adfd91fc79dee8e
font_02_sfnt_off00012b98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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