Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac23d2315679a399…

MALICIOUS

PDF

88.3 KB Created: 2021-09-21 02:53:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e1b4df500733bef94178d3e7d9ad5e92 SHA-1: 12cdd0eee5e4355ff26ddf163f8ffaf631a303f1 SHA-256: ac23d2315679a3992159c5500216e1f626450312cccf404f1cf345498fecca21
196 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content likely prompts the user to install a browser extension or update. Multiple heuristics point to the document functioning as a link farm, with many URLs pointing to potentially compromised or disposable hosting, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the overall structure and heuristics strongly suggest a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://drafthe.ru/uplcv?utm_term=ublock+android+firefox PDF link annotation
    • http://tchid.net/userfiles/file/tegazivobetiwav.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/84571239570.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/bikarazenivu.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/vujidobalazulisesewosag.pdfIn PDF document text
    • https://rosanaalvarracin.com/userfiles/file/lowapipipagim.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/77254700285.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/nosobemumutupojutupol.pdfIn PDF document text
    • http://koslita.eu/ckfinder/userfiles/files/tizumafosuwolerafofi.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/09/21/zokavizaxafenolo.pdfIn PDF document text
    • http://ranch.pl/files/file/jowadugo.pdfIn PDF document text
    • http://skulpt.in/admin/uploads/file/94140713009.pdfIn PDF document text
    • https://heritran.vn/uploads/news_file/xokalam.pdfIn PDF document text
    • http://paneldeconsos.com/userfiles/file/57530077073.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/gutafuwakudiwewajixig.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/7381007441.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136249cb84b7---52311629656.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/9140361365.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/38030622114.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/78349a3f8da27a1f1d05a1dd15016524/85134614708.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210916_2930571F36290195.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/161358e78d9c20---tiramigivujo.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/retosesovapema.pdfIn PDF document text
    • http://markaz-e-durood.com/EditorImages/file/pavufukabo.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/muwilosapetifoniz.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_off0000ecf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF5 10544 bytes
SHA-256: 2a7906938ba6348be6a94c2ab9fcdb0f2b198ad3df785cb485e7d41a0095e108
font_01_sfnt_off00010513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10513 20620 bytes
SHA-256: dc6b4a3172697965b6b583602a30cc24621085ceac2d64fbce72f8ab5c053e69
font_02_sfnt_off00013bb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.