Malicious PDF — malware analysis report

Static analysis result for SHA-256 836d562ebd3ca47d…

MALICIOUS

PDF

70.0 KB Created: 2021-09-04 09:26:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dc509cc7c305383acd2ab961f03f2007 SHA-1: f66926ccdf783875eac038185d2b14ae5c790593 SHA-256: 836d562ebd3ca47d7c4f0e78617446da724bf4670902033b46cd75de2c3ef4bc
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Several heuristics indicate the document functions as a link farm, pointing to numerous domains, some of which are hosted on compromised CMS uploads. The embedded URLs and the nature of the heuristics suggest the primary goal is to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://redeyeldn.com/userfiles/file/razatinobokebesiwazi.pdf In PDF document text
    • http://busangh.com/attfile/fckimg/file///20210622161948_185572288.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/xutebozulipapevuvefesu.pdfIn PDF document text
    • http://rabotatver.ru/userfiles/admin/bilajul.pdfIn PDF document text
    • http://kanomax-nsk.ru/images/tawikis.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/seribaxiretuwonidenegisut.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/52csovke91rjb1bsphjammdmmv/43450957091.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/a60f75336df61e2ac563c3eb25405219/sokuw.pdfIn PDF document text
    • http://jingkangchem.com/upload/files/nunipalalopatof.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202107/file/38811077076.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/8942340746.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5fb27f93c---rirofumi.pdfIn PDF document text
    • https://aurorabersinar2.com/contents/files/95209366196.pdfIn PDF document text
    • https://thietbidiensino.vn/media/ftp/file/fekebonefe.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/r10lg1as2hpejtrgp1o0u469u8/75757915457.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/79055995761.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/gebakaxara.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd5afc9504---51023155433.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16094823c7e2c2---99940070113.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/70968639919.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/87392724274.pdfIn PDF document text
    • https://defi128.com/userfiles/files/wuzaruzisugudox.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/32796638714.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/4uotfd6raumrkq8q557i86bu48/53434672530.pdfIn PDF document text
    • http://guowangcable.com/d/files/mijoku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=glomerulonefritis+membranosa+en+ni%C3%B1os+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_off0000b192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB192 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A9 11144 bytes
SHA-256: c1132023aac309454d3f63bf6155c33b27d50bd1122187b4be885f6d4bdb0327
font_02_sfnt_off0000e334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE334 14776 bytes
SHA-256: 464f4171dd518365ed4f997a8746687e9fc78b1db53333e33bfa76a94298ccaf

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