Malicious PDF — malware analysis report

Static analysis result for SHA-256 74dbec8e10886c06…

MALICIOUS

PDF

95.9 KB Created: 2021-09-02 06:56:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9d01c345e4fb58ca1c543c649f2fafa8 SHA-1: 16f5f93ae717e78413e145051e7368ddba59aa39 SHA-256: 74dbec8e10886c06dccb4a70a2987d70a6ac20cf74bc6e898c12d6e93b35fd83
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://chcial.ru/uplcv?utm_term=union+pacific+employee+timetable PDF link annotation
    • http://gianphoiduyloimodel.com/Images_upload/files/govavamidiwe.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/72538158071.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079901e8c4d6---vadukugagefad.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/doxebenew.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4477cbecd71960eff19bea2712fce475/95179229754.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/finudafumofofalinilifo.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/d8894702aa749ffdf0f8846cebf993ea/62769586378.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/4dd2dca104e7fdae55bac771ad2962da/86582190547.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/32d01676b1986773756c2f949d1fba21/selibopotixelosigupole.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/kabewasowixa.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d6eac389a---buzarap.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/70121836035.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210513/file/16208599684049.pdfIn PDF document text
    • http://chiron-ventures.com/chiron/home/img/upload/files/2107151517379138512pmc2.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/vozobabobewerinikoro.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/87844054771.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/wobatejegebimikudafeku.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/rurixad.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/67663056568.pdfIn PDF document text
    • http://taxfreepoint.com/file/82701723645.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/74880358358.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/lonitulogogazuvasitaj.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/bunewojevaxixadafup.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210720161307.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_off000113f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F5 10636 bytes
SHA-256: 2b563ce7a5a2a7a8e1613832d2a23c432a85c697ace7b97cca50d530a3e3e972
font_01_sfnt_off00012c15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C15 17524 bytes
SHA-256: 7b4f84f99b7517cd2ec4e8b64e1d818acfa2b6a25c285fc589a4200fca0b81c2
font_02_sfnt_off0001593b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1593B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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