Malicious PDF — malware analysis report

Static analysis result for SHA-256 52166aabdc0e0a8f…

MALICIOUS

PDF

72.4 KB Created: 2021-09-17 22:25:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 54ee2d2dd3a1bd42db23b19b95c68e47 SHA-1: 20848f73c8ffc627d908f5948e1548a1194e4549 SHA-256: 52166aabdc0e0a8f355d30968f783980677c214f3e96e7d00610d02a60d7f099
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://laborke.ru/uplcv?utm_term=traffic+management+act+2004+parking PDF link annotation
    • http://qdxqw.com/uploadfile/file/venezoniv.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/zikugipav.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/2272705852.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/8034916158.pdfIn PDF document text
    • http://lavalnerina.com/userfiles/file/tanomuvadubujisos.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/99578911885.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/6194990615.pdfIn PDF document text
    • https://eol.org.pe/ckfinder/userfiles/files/82312588869.pdfIn PDF document text
    • http://bluelakehomestay.com/uploads/image/files/93854862945.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/m5t2cgqj4uv6n3ukf4sa0m7m2h/vezaw.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/pilob.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/jufiv.pdfIn PDF document text
    • http://ambulanceservice.pl/userfiles/file/xojawirefaxuvipexuj.pdfIn PDF document text
    • https://signika.pl/Upload/file/malosagiz.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/xowijimutagin.pdfIn PDF document text
    • http://yourmoneyyourbank.com/uploads/File/jarivozoxesepem.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/navibatudenepapaguxumik.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/0f8ed2e29c61a45c048f261581dc27d1/dapesedofume.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/161327d3cc0203---97941145879.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/xomivasomexixebo.pdfIn PDF document text
    • http://ajeah-intl.org/fck_image/file/71270416230.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/74810557035.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbcdd96174---65618974110.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_off0000b9a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9A6 10864 bytes
SHA-256: 2b3b5e3a8422efeb2b89a3d5e7911e9f3927c9c0e7f6a4303bdd29cc13674635
font_01_sfnt_off0000d2d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D9 16040 bytes
SHA-256: 9224ef99ea7ab8fd4512c7219907c0b0ec8f0709aeefffd16c084251e18af53d
font_02_sfnt_off0000fbb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1