Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d3935205626b557…

MALICIOUS

PDF

90.1 KB Created: 2021-09-17 11:38:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7c5b7e4185196cb6e3f07a8e228d5988 SHA-1: 56240aa2e7dde214c80a2125fa3a4a3c9efe47f2 SHA-256: 4d3935205626b55732398130067745b9902aaa78f715f9721078da96f909200f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://drafthe.ru/uplcv?utm_term=a+little+life+pdf+free+download PDF link annotation
    • http://nikolalepojevic5.com/multimedia/file/nakojusujapipimiponoba.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/sarokus.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/zutuzofiputenusavixikezug.pdfIn PDF document text
    • http://friulanapanini.com/images/file/84320117842.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138713119847---vesivokowejat.pdfIn PDF document text
    • https://willes-gb.com/uploads/files/202109031137057773.pdfIn PDF document text
    • http://bio-scan.com/userfiles/file/pabow.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/xitaxumufajexegezara.pdfIn PDF document text
    • https://atavio.ru/files/file/xasowebebizakavitewunorab.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/wimepitasobaronabi.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614441a05cf12---73891574916.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/tineve.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/89745070023.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/topapuvipugusug.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/32919571483.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/55198056256.pdfIn PDF document text
    • http://xn----dtbhwhggdaoqfh3d.xn--p1ai/media/file/95785543646.pdfIn PDF document text
    • http://dnt-mayak.ru/content/File/sijumiwozijojenija.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/seterabebukekizo.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/96154611044.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/91076431652.pdfIn PDF document text
    • https://tennis-samara.ru/img/file/zigof.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/du1gjlj7v384og9532cau2etmh/nozoluzawol.pdfIn PDF document text
    • https://losungversorger.com/product/file/83219669194.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_off0000fa94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA94 10388 bytes
SHA-256: 317c374ff740f73482dfdbcc22f9e16a92cf1497ca996d0369153908fea8b8eb
font_01_sfnt_off00011238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11238 18728 bytes
SHA-256: 0e7ea073fe0e27249cb5497d0a8f98e587657abf0ac7ce85f8320e5b87239089
font_02_sfnt_off0001428f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1428F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1