Malicious PDF — malware analysis report

Static analysis result for SHA-256 3faea36c07252a5e…

MALICIOUS

PDF

106.8 KB Created: 2021-09-08 19:30:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f0649615ac854fe9400aeaaeac0f1cf7 SHA-1: 2afd5a3742e0ecebff546aca6c0ec93b496a7eb7 SHA-256: 3faea36c07252a5e3a06dd12badf9142a9f3122f512e4dc4261423da6bd00bc2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the nature of the URLs and the PDF structure itself suggests it's part of a larger malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://print-resource.co.uk/ckfinder/userfiles/files/sifuwenena.pdf In PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/83997095984.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307b6f1c1ac---86583340388.pdfIn PDF document text
    • https://8foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/fubanipidodevojapogopa.pdfIn PDF document text
    • http://eraldocomo.it/userfiles/files/rarenebafadakamavegelofi.pdfIn PDF document text
    • http://szilasfood.hu/pic_upload/files/44522678967.pdfIn PDF document text
    • https://foursservices.com/nbloom/fckuploads/file/gazililerivawekana.pdfIn PDF document text
    • http://ttfi.org/app/webroot/userfiles/file/72772980808.pdfIn PDF document text
    • http://chuaphucluong.com/uploads/image/files/bidopadivejubezafil.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332784f2a46---pokewafoker.pdfIn PDF document text
    • https://perfectprojects.ro/userfiles/file/34616536118.pdfIn PDF document text
    • http://manu-transport.com/documents/file/vodejonasukovemotosefo.pdfIn PDF document text
    • http://forepic.com/_UploadFile/Images/file/87435354743.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/45c0b78e3a25a188f35e22bde2d5141b/56230877618.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/sapawugolebavi.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/rulurajaturerodamusubalop.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/zimanedafa.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/58967034825.pdfIn PDF document text
    • http://eastcity.hu/ufiles/file/movifevobu.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/6835285521.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/34258066503.pdfIn PDF document text
    • http://peter-crooks.com/userfiles/file/96863639752.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/15865538814.pdfIn PDF document text
    • http://vinhthuanvietnam.com/upload/files/jotunudasuwazepikejin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=enciclopedia+de+aperturas+de+ajedrez+pdf+gratisPDF 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_off00013500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13500 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014d12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D12 21692 bytes
SHA-256: c9e36bf4b5a983b1b763d23f458e4082cd568e637d42520744aa65bf718237f6
font_02_sfnt_off0001834d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1834D 11068 bytes
SHA-256: 868fc80c39cedc49de503c16c5d48729b20ec3002c2f25d74670ee95e2dbc564