Malicious PDF — malware analysis report

Static analysis result for SHA-256 45b1c62d43ed8b7f…

MALICIOUS

PDF

73.9 KB Created: 2021-09-17 10:59:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9c976285710a4e19bc9d7c07fba85d58 SHA-1: 35a75df5b18edffc7d5c2975613d62ee3d2e81c3 SHA-256: 45b1c62d43ed8b7f8512b59aa3907e19bb4c56d12c343a1895d07e2dba9d7cf5
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://ofly.om-digitalsolutions.cn/upload/files/36197992590.pdf In PDF document text
    • http://33podarka.ru/pictures/files/kisotebazozazologulas.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/79368808641.pdfIn PDF document text
    • https://primer-spb.ru/files/files/82982559276.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/vujipasodimonokutadopomu.pdfIn PDF document text
    • https://oasis-travel.ro/files/71920725681.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/pukobij.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/41163160861.pdfIn PDF document text
    • http://srilakshmienterprises.net/uploads/juxatotelazujenowuj.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/52683810224.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210907_030852.pdfIn PDF document text
    • https://ozsersogutma.com/upload/files/41946796423.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dad6001d82---rabuwani.pdfIn PDF document text
    • https://tigapilar.com/upload/files/31167559614.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/52320288710.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/bokumujixekefewivuka.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/4478447443.pdfIn PDF document text
    • https://cooperadora.grupocreartel.com/documentos/archivos/65425928507.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/57a3d2221db807297f557895a16f04ee/sipigefogurixota.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/a8cc49f7ec272cd8d1c8a866f6451edf/xajazidamasawebez.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613e56f4457ca---74571942125.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/83235617508.pdfIn PDF document text
    • http://dywin.com/uploadfile/files/xutafuxozerifufufitupuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=examples+of+non+functions+on+a+graphPDF link annotation
    • 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_off0000bc9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC9A 11112 bytes
SHA-256: 9c2dcc2fd51f4de58cf05cb73abe07f97a4f59f52c6484be420490e3df110313
font_01_sfnt_off0000d656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD656 16668 bytes
SHA-256: 26ee133032e81d5d578dd0c8ef255c15d879c2b16c1d988d4985a56e5a228edb
font_02_sfnt_off00010216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10216 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1