Malicious PDF — malware analysis report

Static analysis result for SHA-256 f59640707aa507eb…

MALICIOUS

PDF

73.1 KB Created: 2021-09-05 21:48:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 338af41b00400d0ec53d5d736dd7e0db SHA-1: f3366196fbf2f7c81fe8d962b14821eeba8798eb SHA-256: f59640707aa507eb300c31ec16a149706717ccbbdc486ea1d18bf3554159299b
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised websites and disposable hosting domains, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://demo.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/57953075672.pdf In PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608125bdda935---pejagivaza.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/0fc9f1f2061e1fed645d6780b6a7da0d/82042747429.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607594b09fd54---dajasapisexusikos.pdfIn PDF document text
    • http://acquadiqualita.it/ckfinder/userfiles/files/45796015260.pdfIn PDF document text
    • http://nature-revive.org/files/file/xadibesoxubuxulomebeda.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/b1402cde1a3afe61a1fdfb57837c405a/75598086511.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/sujudusezagoxuwadisepubu.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1b576c669---63570650067.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/33effbe65d2b312b3743ae742bf11e50/96845519213.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/85098430244.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/34852740918.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0b248ee600---61621803374.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609130e19bfc3---56399603722.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/44731456624.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/94464068827.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/71dc7750844fc4f1573565f259d40bac/moxomewoto.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/440689857.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7d138e93b---45144478573.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160966f03afcdb---96656963336.pdfIn PDF document text
    • http://velocimapper.com//webfiles/file/wowenabe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=yds+publishing+impact+grade+11+pdfPDF 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_off0000b4d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE7 11220 bytes
SHA-256: 6503139de8d2a0874cc2a1e4c365fd218e67c9ce33415ec11de2a64b6bdb6a1c
font_02_sfnt_off0000e697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE697 18772 bytes
SHA-256: c870b3ce5fab6fdbe4e3c357127c99628b3aa8ebc34c1dd897504d89e3fef565

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