Malicious PDF — malware analysis report

Static analysis result for SHA-256 6244a94d40f2f30a…

MALICIOUS

PDF

91.5 KB Created: 2021-09-05 00:04:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 893af5af287429e8e5e951c3aa2ba64e SHA-1: 13d4e53983d3764c31afdc9dc96bf5b3a987a46a SHA-256: 6244a94d40f2f30abdf4cf214163d0d8ea855efda51ae86a143bcfa719e2de60
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://fptica.ru/images/file/xorox.pdf In PDF document text
    • https://cplastik.com/data/cms/file/bojuxorubivufoxadujawej.pdfIn PDF document text
    • https://aspirans.com/files/file/39551648960.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071bdea828b2---bisinawulirawabak.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/vq4l95u9u6sc451fcidknakiia/26651303899.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16102beb785b43---fegumegefi.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/bifosupu.pdfIn PDF document text
    • https://5uempat.com/contents//files/48579213528.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/170579307557c5dff226324012c26702/26073182940.pdfIn PDF document text
    • http://psychologadamczak.pl/userfiles/file/65107314454.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3fc909845c---lenegeragemenizukamasosu.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/8692b7fe3dab8e06b2645575c7d313db/zajiwisekepofekegusumeget.pdfIn PDF document text
    • http://ongnuocdenhat.com/upload/files/lanejeneke.pdfIn PDF document text
    • http://shangyi-pump.com/uploads/file/030700378535.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/92235937129.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202105/file/1620325858.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16091289b8cf04---21422338893.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210613020027.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/3b4b2f5362a3349bca657b5e263a75ac/91387958893.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/nalegu.pdfIn PDF document text
    • https://lavineriablend.it/file/logiwepezomotewot.pdfIn PDF document text
    • http://simonide.org/userfiles/file/85971342160.pdfIn PDF document text
    • http://cochu.net/resimler/files/82831763462.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/48370868286.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=peta+dunia+pdf+downloadPDF 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_off0001054c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054C 10408 bytes
SHA-256: d0797301f54430e64b638e686b662812513ac7712d986c631320deed1475bbf2
font_01_sfnt_off00011cfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFD 16628 bytes
SHA-256: 1a79d09afe5c4d15faa77401b59ea369693495d9d2fd567e83f7feb861f64602
font_02_sfnt_off00014850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14850 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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