Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bdcea3773fa18c1…

MALICIOUS

PDF

88.5 KB Created: 2021-07-24 06:10:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d5a21ea243e40b10eff3ae2eb657eaa6 SHA-1: abd19e2077f07e10309d8cf4057d834214ba340e SHA-256: 5bdcea3773fa18c1784b534d14e2b5e4355b8be5b2a9476fdba357ece4d2516f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress installations. The primary purpose appears to be directing users to potentially malicious content or phishing sites, consistent with a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4d61a13f38.pdf In PDF document text
    • https://adsbudget.net/userfiles/file/25777820470.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/4fsebatiurkkq694i7rjv3lbg1/72969249093.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/hofqhbnslq6lkbn3g6t70vl86q/84840904877.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/094d0b26039692d5e71f6913921ad2ae/97343355948.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/519672a037922f440fd0383a012a4b3d/98929445215.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16095294eee68a---nekitirududagowakugi.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160dfddc6cf605---kutuwizajo.pdfIn PDF document text
    • https://clove7.com/userfiles/file/86390476717.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/kegawejadebakotad.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/1e682d011500f07259e1abf6081096f1/tivemoka.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/letjgh8mas16cv2k78i8nukf5d/19332840141.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/78443323248.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/ff7c510097b6dc2d02b2115fb6f9fc51/41575251892.pdfIn PDF document text
    • https://coluer.ir/documents/file/rakuxujigiwiwizi.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1623300256.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/861ae2d5fa2ae012b1dba692da6c9b64/9050338676.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/e27bqirtoe5edchorfjflkp97i/zewad.pdfIn PDF document text
    • http://www.buildingmalawi.com/images/uploaded/documents/65178773625.pdfIn PDF document text
    • http://skncn.com/u/files/demeduxameso.pdfIn PDF document text
    • http://www.chubsorn.com/file/files/73838170597.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/89650f2116a4e470e22fc5c73ad5a8b3/94356511896.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=bun+b+trill+album+download+zip+sharebeastPDF 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_off0000f210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF210 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A27 11096 bytes
SHA-256: 482bb89c253bfa667d9afe4997657355a19c716fabd72858c08e633dbcc21aae
font_02_sfnt_off000123af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123AF 18248 bytes
SHA-256: 2f30fd981be0b5ae78792d7bf61c3ece59715c931dfaf70c03d46ae1c1454a66

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