Malicious PDF — malware analysis report

Static analysis result for SHA-256 6063d66f13868c52…

MALICIOUS

PDF

88.2 KB Created: 2021-08-13 23:42:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d76da0268345a25c8ede49398ddc348a SHA-1: 9465b5ae972275d637ea35c01c8a9703c113bf5c SHA-256: 6063d66f13868c5285f6d7b86d9fc3ce73d916c12fb757d86e315c8efe629926
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to other PDF files hosted on various domains, many of which appear to be compromised or disposable. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The primary function appears to be directing users to potentially malicious content through a link farm, which is a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://cogersquest.com/clients/f/f6/f6194b381802d71b6842d6160e8859b1/File/73308000551.pdf In PDF document text
    • http://fotocaroli.it/userfiles/files/81438877511.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/vototoxe.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/botebidug.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/ziruw.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/53178955132.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/30287640279.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/28nnavr2fu28ktnbc50h7e0hsu/8512043802.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/22905182850.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077811b2fd07---fozaziwajaro.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/8c94b17d1c6bc7bcf2b31747e9ccb280/62305979296.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/6568e68c3a2887882278343c61dcbe0c/lagote.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c00ecd834e---603939146.pdfIn PDF document text
    • http://bangkoksolarpower.com/syner_upload/images/files/77630176028.pdfIn PDF document text
    • http://rhondachem.com/d/files/xuworelofokomuk.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/3731717e3de7b79cb6f34669289542d1/71625490638.pdfIn PDF document text
    • http://valifyrepapillon.com/clients/6/68/68e1c6a84db99a04c21676ff826d6e37/File/18372001747.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/dikelanefopolanama.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160823f7934f66---dukifomoj.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/kuzadotazijane.pdfIn PDF document text
    • http://calliopegoodrich.com/clients/73417/File/wewogenip.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb1aec2b82---59388150862.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/62119328708.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/856e30b9c37ffc580d0d8453911889ca/zujetekififojiseliribok.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/c649c8975efe64b3532272e0e0ee9fd5/12139230377.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/nabatos.pdfIn PDF document text
    • http://www.climatisur.com/ckfinder/userfiles/files/17979095790.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=what+are+the+theories+of+health+psychologyPDF 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_off0000f41c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41C 16748 bytes
SHA-256: 443c9718e31d14b528ad1db001f78233bdf62555bc4bf0bfb57c02d591a161a8
font_01_sfnt_off00011f0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13726 10760 bytes
SHA-256: 96aaa482419646c41782bb001d13e0190353327ee8cfed9f6c58c5df60894f02