Malicious PDF — malware analysis report

Static analysis result for SHA-256 84be481e5e0728ee…

MALICIOUS

PDF

84.5 KB Created: 2021-09-07 15:43:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 838be962b1a007cf8726981454c2eac0 SHA-1: c5bacef4331e4d5b9ae49b3a2081cb935ea9faf0 SHA-256: 84be481e5e0728eea91ea49b2789a7920e1b0445a6f3cef152b68543e8c13fef
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. ClamAV and ML classifiers also flagged this file as malicious, specifically as a phishing trojan. The embedded URLs suggest an attempt to redirect the user to malicious content, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113d8c840f15---wezerexiwabefefilenutuja.pdf In PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/5foq5cqkg73hk1sst7tmmnqmm5/53574003448.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/rizuzewo.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/2926126290.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160920704cfccb---lebexozemixonu.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160858404ee4bc---larakitugatadufux.pdfIn PDF document text
    • http://wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/pugebativifozidomimubopeb.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/9e3321d732681041cb14ed3226e01fb5/jigipuxaxerutorulojeborip.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/15072733782.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160fb739f2f7be---75302315987.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/9222698915.pdfIn PDF document text
    • http://standardamulet.com/files/files/poresodumiwuvijebopefebu.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61248975949.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/c5e5732330b2530e1e94029e50760003/65185471248.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/84082691458.pdfIn PDF document text
    • http://canadianrockies.ca/files/file/24444759684.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/9747134123.pdfIn PDF document text
    • http://btfa.tw/upload/files/xebunusararaxadijozil.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/xojaluvofasagejejelewat.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/84338013512.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16123c42e65ede---88352775628.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/puwazukutebusujixu.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/fowaginilepijikuperugegig.pdfIn PDF document text
    • http://wedding-ideas.ru/ckfinder/userfiles/files/4776116457.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/26627265815.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=melhor+conversor+de+pdf+para+epub+onlinePDF 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_off0000e475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE475 10916 bytes
SHA-256: 00026d81c815bcd813d84d46ba59ebab9840cd748b69c5ba8cf960a751fb8808
font_01_sfnt_off0000fd6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6E 17936 bytes
SHA-256: 1ed312f90334180bb5aee192a2957747cf7e9a9dfa6d9e543c50d12d39d075ba
font_02_sfnt_off00012c5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1