Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fe8d6aabef60bcf…

MALICIOUS

PDF

90.4 KB Created: 2021-08-23 12:54:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: da73e30e0ebcc1fbacdeb2058900a56f SHA-1: 80567d66893d2804d93860317a7c877dd018a820 SHA-256: 3fe8d6aabef60bcf4d7706d79691f9a8ec841a35f14464457848623caed77345
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 upload directories, indicating a phishing or redirection attempt. ClamAV detection as 'Pdf.Phishing.Trojan' further supports malicious intent. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802fc61b943---gagunufebonezabawo.pdf In PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe5472c7b1---bafepewavovisenajojexofi.pdfIn PDF document text
    • http://vietkinggroup.com/uploads/userfiles/file/vaduzivuf.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/9bae51401288cb935c9299a2892fa018/77373993378.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/e9011b711f94d3d7244279e8ce16f3d4/gawewizalasepe.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/30497c685ee05b9a5aea6da20f92e5a6/20920972667.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/gasadekojumifagowu.pdfIn PDF document text
    • http://mobilenmr.com/files/files/niniw.pdfIn PDF document text
    • https://kompaspt1.com/contents//files/lofuwojixajarujo.pdfIn PDF document text
    • http://novastal.pl/userfiles/file/47109087741.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607264963351b---16445100826.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/3f2627fafed5617a8cad0b934bb76b05/58037772919.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/e87bad93bbe1ebb23ba7261761d065f2/40375314088.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/rafebewisaduduwabus.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/o5s10c5g8eh59j9muu2esk9ve4/21876325218.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/2965v5apcmulcm3nck2ujvs860/nasaviruzevasalevimovam.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/ofmf01utvtrepaqocchdedmiki/koxurezumuguxajo.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/85226402235.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/99843508923.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/dupanitifoxabigu.pdfIn PDF document text
    • http://www.celso.org/download/rukemafawafapejaxik.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b4b923ece---47099696008.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/2l4q8s2fn690bpitrg4jr81eu1/kowoveloli.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c1bdcdd4234---depadonugesop.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/suwuwataborudi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=are+humans+endothermic+or+exothermicPDF 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_off0000fe32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE32 16864 bytes
SHA-256: f1eba52298af1d7060030ba280f26760df715359d61371692164dd28d93906dd
font_01_sfnt_off000129a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000141ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141BA 10772 bytes
SHA-256: ef68bdbbe051c7bfd6ad69accfa6bcacadd0641a5e6cbb515fefb4e0095eefd6