Malicious PDF — malware analysis report

Static analysis result for SHA-256 1af4275dfec1c756…

MALICIOUS

PDF

71.4 KB Created: 2021-09-27 12:32:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 79178d7d015b4a3479bb7bab2e0ce8ae SHA-1: 8e4595b3678a64360646eaab2c3161253c68e8e9 SHA-256: 1af4275dfec1c7564035c3c8b9a39ff93b35ffd4e6023cfa9fe19f11be737cf0
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://pistant.ru/uplcv?utm_term=lucky+patcher+apk+download+2019 PDF link annotation
    • https://bunianco.com/other_files/File/89617006650.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/xemuneganevarab.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/33433094136.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614b25d72e086---44511864227.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/161445c9428b69---54030030782.pdfIn PDF document text
    • http://king-tableware.com/uploads/files/202109261017165497.pdfIn PDF document text
    • https://vhcvietnam.vn/ckeditor/images/files/74215330698.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/343qu50a05djgvcsfnjm0dap64/tululebokulewesifuvigi.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/tovojipe.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/52088685648.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/65491147973.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/24266993851.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/fezigawijipomesijo.pdfIn PDF document text
    • http://gospelpour100voix.com/fichiers/newsletter/file/vegikubipivineradofujafe.pdfIn PDF document text
    • http://jj-metals.com/userfiles/file/2021090804023473499.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/witaluluzitobofememor.pdfIn PDF document text
    • http://hasomedia.com/userfiles/file/xekedililobapu.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/68117019326.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1631163741_b6cf19bfd2.pdfIn PDF document text
    • http://myphamvickwhitebeck.vn/luutru/files/falakememodozomot.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/18264195578.pdfIn PDF document text
    • http://polenes.cl/userfiles/file/botevuratuz.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/zonasopakagurezazubur.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_off0000b39f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB39F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB6 11164 bytes
SHA-256: 42c62bdf0c8ccee1ba05535b4b170e8cb28dac146305f3c2b46f17e0662152b6
font_02_sfnt_off0000e5f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F3 15936 bytes
SHA-256: de0adf590ba8ab0f17379e92068559c4a2f3b245686ada0354c22537d9fd62ad