Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbd72236ee75a93c…

MALICIOUS

PDF

87.2 KB Created: 2021-09-11 11:44:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 541900758dfb92f2794a82c33cbab04b SHA-1: 68aaac686d2b4c55ece579ca88d6d5109a147d70 SHA-256: bbd72236ee75a93cccaa9d72b22cbd3a9ac3d82f416279488dfd365aadae40d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable domains, likely to host further malicious content. The presence of embedded URLs and the structure of the PDF suggest an attempt to trick users into downloading malware, potentially through a social engineering pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://rajatotogroup1.com/contents/files/dufasetakebamixipojino.pdf In PDF document text
    • http://softtox.com/new/userfiles/file/sifumenisixeponixiw.pdfIn PDF document text
    • http://mkbeauty.vn/luutru/files/2246503971.pdfIn PDF document text
    • http://melabo.com/upload/files/duvizik.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3e1737380---gumedebafelesu.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/53706582499.pdfIn PDF document text
    • https://wrd13.com/force/file/44287730070.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360172842ab---34129757330.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/gugulomijefowoxetuzulofe.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/68187933091.pdfIn PDF document text
    • http://thegioicamdo.com/upload/files/61451878455.pdfIn PDF document text
    • https://www.htlexpress.com/ckfinder/userfiles/files/vedoxamadojorinaxa.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/runolivalev.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/60238073538.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/bc9edc13f4e2520c480c9a460b3138a7/2535538037.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/mabaforegaxiximaroloz.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/7585316521.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/99284518006.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/25917811800.pdfIn PDF document text
    • http://chamdure.com/DATA/files/titiditiwobidereso.pdfIn PDF document text
    • http://sperrincaravans.com/images/file/18709281603.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/zulebowunap.pdfIn PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/lokopodubadebogibodiwuwal.pdfIn PDF document text
    • http://tano-cable.com/d/files/latukururuditabiduzusidux.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4ef46f3ea---50002347479.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=avengers+game+apk+offlinePDF 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_off0000f19e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19E 10740 bytes
SHA-256: b98c6ff0b21d58f8d35833da1238280d1daaa813c49da97b236f2293e3f8d807
font_01_sfnt_off00010a4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12261 17096 bytes
SHA-256: 70416cbbdd788bdec2e9ef231149e79d753555629b83154bcc0c330313395f60