Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a94cf9f565c2ba9…

MALICIOUS

PDF

76.9 KB Created: 2021-07-26 07:41:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 397ab2df691336ef5e8b3c412e8c7dc8 SHA-1: 937f9545a120c870de13b6f82f77ce176ee07124 SHA-256: 3a94cf9f565c2ba90865d6a1896c961e2bd595e27c9d3e842ddc3c00dafaac7a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and URL targets are indicative of a malicious document designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://doingthing.com/downloads/blog/geust/files/kowetegemotunibobod.pdf In PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/286smkantdevuqtjsi1felieu4/wewezogajonerowi.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/f12f6b7a38c1cf444280873ddd8ed508/vonurisasel.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/f2e3fe0459dd5ae456bc76ca43f585f2/54913689212.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4638853ab---9427965617.pdfIn PDF document text
    • http://itfind.ru/uploads/file/84514066234.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/36852064311.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/e0b0036a664e137d4fe13b65dd15e634/dunokebozaj.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/77938191410.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/275a1u3sf8qjv7nmliekp6cqnp/93664993676.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/88124979304.pdfIn PDF document text
    • http://daydala.com/userfiles/file/4637378369.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/35413207763.pdfIn PDF document text
    • http://mebco.ru/images/file/5445542671.pdfIn PDF document text
    • http://vizcsap.hu/files/file/9633533223.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/36397470187.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/99793000094.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/d2a4e368cac4e1c2a38525c0e9340bb5/43394144444.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/suridavidunaropurusu.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/25669354214.pdfIn PDF document text
    • https://voyageaventurenepal.com/upload/files/51986618375.pdfIn PDF document text
    • https://senhewood.com/d/files/biwedagafilotu.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/41dc55afb2457f3e73afc20a203697ae/zaluxonigededavu.pdfIn PDF document text
    • http://marketherballize.com/ckfinder/userfiles/files/gofuruguxobiran.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/nozuxanokanonelawewabomu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=cambridge+advanced+english+book+pdfPDF 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_off0000c641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC641 11296 bytes
SHA-256: 2116cdf120bb237d6e354974b159a8c253174c0050d78f3484dbdb70d8130ad4
font_01_sfnt_off0000e022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE022 17500 bytes
SHA-256: 81edca6c1fa82489c53279f3832988dd287b57fd746c3c06178c75beac3ebd3c
font_02_sfnt_off00010cf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1