Malicious PDF — malware analysis report

Static analysis result for SHA-256 edd2c7e0253196d1…

MALICIOUS

PDF

81.4 KB Created: 2021-08-24 21:13:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bb3e71c6f37201aa8a9c829a0d1a030d SHA-1: 138888b4fa57de608d99571692bc6308e6a6df71 SHA-256: edd2c7e0253196d1655a77bc3cdf8ddeb3d5d2d8236e7669fda111c3a76a4069
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a link farm for SEO poisoning or phishing. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and link farm behavior are indicative of malicious document delivery.

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://allgeology.ru/ckfinder/userfiles/files/judikuwuxevexazolira.pdf In PDF document text
    • http://xinghui.co/upload/ckimg/files/202108110818075327.pdfIn PDF document text
    • http://beateromer.com/bilder/file/wititawolajemi.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/16068862857.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/sobolaxanigu.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/81075130135.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a59d48865af---popovomagapefujali.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/kademinefa.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/tumemekanod.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/p393jmr1ugc3t67u6f82ccnefr/ribako.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/dedagozetixugomolem.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/73321385287.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/bd401aa35f745805706021ae8cdb72de/repaligaxirajerovixojusi.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/7cab424ed5712db41b9fe46810ece114/9045024844.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3174068c8c---57338991521.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/054bab067b0975e048268af3d0c67392/mufibugevuxabi.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/89659319592.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/namupobejawalifefo.pdfIn PDF document text
    • http://70sromans.com/clients/871711/File/12142698079.pdfIn PDF document text
    • http://location-venise.com/italie_documents/files/59149153640.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085768c176b6---66646436329.pdfIn PDF document text
    • http://xmzs.org/userfiles/file/19629173051.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/xodupefuwejub.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/nilinese.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/95850562521.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/lasiwenasawem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=what+is+test+cases+in+manual+testingPDF 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_off0000db78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB78 16576 bytes
SHA-256: 933ccac579acf9b54ff2be61bea297626a907c667a80f185c71369900d9b1e28
font_01_sfnt_off0001066e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E85 10548 bytes
SHA-256: 4dbc21fafb38060ff1ee0b2f0ad8c065b9f843e45faaeaabe2a85ce30129fd33