Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae6185b31257c9f5…

MALICIOUS

PDF

81.1 KB Created: 2021-09-08 19:26:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 64978e429db0cc38892c15313943f527 SHA-1: 591e364022c9d450f80deb3fc822fcceccde5753 SHA-256: ae6185b31257c9f5dc3b47a60f6549f56721ccba3d5a07ff3b69bbddfef936eb
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised or disposable hosting. Heuristics indicate it functions as a link farm, likely intended to manipulate search engine rankings or redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, possibly related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://www.gesas.it/media/mailinglist/file/15361007169.pdf In PDF document text
    • http://alde-pace.org/ckfinder/userfiles/files/50827068716.pdfIn PDF document text
    • http://igs.compcierge-asia.com/ckfinder/userfiles/files/1418072624.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/nuvapetevuva.pdfIn PDF document text
    • http://furniture83.com/upload/files/jivafuge.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/50257881289.pdfIn PDF document text
    • http://keramann.ru/uploads/files/74043539780.pdfIn PDF document text
    • http://bastola.org/userfiles/file/88901670130.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/vawevefupelifiwi.pdfIn PDF document text
    • https://csmgh.net/pevron/www/img/file/rarezirubasupoxogimeju.pdfIn PDF document text
    • https://journalofcritique.com/ckdosyalari/upload/files/tezozasumalidufux.pdfIn PDF document text
    • http://thietbidienmpe.net/upload/files/tesabu.pdfIn PDF document text
    • http://ride-on-earth.com/images/blog/file/bosizexadonuriporixudu.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/94301538839.pdfIn PDF document text
    • http://onlytech-tunisie.com/userfiles/file/tonorigimafu.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210908092442.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/25a2fa8010ca5e75529ba114e7d559bb/18399858180.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/89282114709.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/totetarekenenanawaxasul.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/52156179446.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613388f93e869---peradafubakukot.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/34366337980.pdfIn PDF document text
    • https://funbugs.ie/userfiles/file/5760131506.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/nulewojotoxakuzuwojeb.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/282vj8sj7fcmfc466fdessj25l/65571209830.pdfIn PDF document text
    • http://derp74.fooden.com/UserFiles/files/rizagopuke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=piaggio+mp3+250+workshop+manualPDF 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_off0000d3eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EB 11296 bytes
SHA-256: bba6b7b663169bf3e3799a15c86a409bc3cea12b54658ecfc1cceff657ffb0b3
font_01_sfnt_off0000ee55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10667 18000 bytes
SHA-256: 0ccad6a365b242af37616030a694ea13bb289b8b34bb129c773796ae2eba405c