Malicious PDF — malware analysis report

Static analysis result for SHA-256 a723c1614d4a0793…

MALICIOUS

PDF

84.8 KB Created: 2021-09-13 23:46:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 2b186fe561538bbd2ce7009bab2adc86 SHA-1: e3408f3f8a4607fac6c746504678cd9fa2884300 SHA-256: a723c1614d4a07934b96474b7af62d7ba01dc39278b2dda9a4ebc22b5bf85b13
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external sites, many of which appear to be part of a link farm hosted on disposable or compromised domains, suggesting a phishing or malware distribution attempt. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' strongly indicates the document's purpose is to trick the user into downloading a password-protected file, likely containing a malicious payload. While no scripts were directly extracted, the overall structure and URL patterns are consistent with a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://rmp-traueranzeigen.de/cms/files/19481060527.pdf In PDF document text
    • https://filetorme.com/upload/files/6103414965.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/fesodojezelidevim.pdfIn PDF document text
    • http://valkexclusief.reviews/app/webroot/files/userfiles/files/63079776901.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/vumixesopufirugejedi.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/saruvazar.pdfIn PDF document text
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/40732569095.pdfIn PDF document text
    • http://kubabus.cz/novy-web/upload/file/7044764911.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bce9a60ff8---68694414156.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613d121244c7a---67269766349.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/nepow.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/99555641961.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/pevonulefogod.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/74936647499.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/malowibukaxejolukaxagi.pdfIn PDF document text
    • http://pb-book.com/user_file/file/8039262157.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/legapojitexaf.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/nojapuregipiguxix.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/69716912064.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/1ak9n39epv88uvabv0p6kurnu2/62845522965.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/kuzilojededokedetagedafup.pdfIn PDF document text
    • http://multiflex.ru/userfiles/file/83233526796.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=cacher+photo+et+video+androidPDF link annotation
    • https://www.posluh.hr/ckfinder/userfiles/files/95168255034.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_off0000e5b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B4 10492 bytes
SHA-256: 43ca9da7a90032589cc2ec6e6a3fcf44e5f0cfab25fc4d3c66e014f04c48c64a
font_01_sfnt_off0000fd83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD83 19224 bytes
SHA-256: 25de1c2e3640a34594f27b54bab8fea32eb9243c1d6b4511017807d7e695c9a8
font_02_sfnt_off00012dd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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