Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a1e0b620efb7e4b…

MALICIOUS

PDF

85.6 KB Created: 2021-09-03 04:02:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2159103c98ed8b6d88af0323a62bbbc5 SHA-1: 1c07762cd45622e098971bc43d87da1cd25e4cdf SHA-256: 3a1e0b620efb7e4bba3563740bdea72ae7f660894ce51ec3ea997292a4cea99e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=texas+state+board+of+pharmacy+technician+training+manual PDF link annotation
    • https://trvstore.com/userfiles/file/siluxoxobi.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/dedidazabu.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/c5d26093c4bd2a9ddae24a135141413d/11660023163.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160928fbfe513a---fajimedubilam.pdfIn PDF document text
    • http://artikos.pl/userfiles/file/jovut.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744eda2ed2e---80339697909.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1612590d578f3b---netujazadewesobim.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611c7765e8e2b---deloborepelologulutibo.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/nekagemin.pdfIn PDF document text
    • https://2winit.com/Files/files/japuxesud.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/monatiwunewuxeb.pdfIn PDF document text
    • http://stylekd.ru/files/24486244254.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1607e79f401b0d---91273268772.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/4ijp00svifiss6vgdlgv0tco0s/ramer.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/gofevawawegigoviduwotufa.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/86655724405.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/gidaxaladiza.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16099b35dc8451---tijinupitatug.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/49037074238.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a87d93a414a---40122943874.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cd7a8a8ca89---85811577363.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/57c63280020fe78fa85f650debf1401a/mipitumuxumigiw.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8f561018cd---83041923954.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/zubeketewiv.pdfIn PDF document text
    • http://hookmyweddingup.net/clients/73542/File/xavinusimedolukidulibu.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/ba0f4f9733edd80dde41afaf57a61731/24778667725.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_off0000e8ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8ED 11484 bytes
SHA-256: 30ee1ad32d661885f8aebade49ef1e472ae8db5c358506dde6f1a918dfc6d627
font_01_sfnt_off00010390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10390 17000 bytes
SHA-256: cfe2ec684c93e351afce2b3c17307b761616e9137230c6bea3d4b24c4defcf31
font_02_sfnt_off00012f9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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