Malicious PDF — malware analysis report

Static analysis result for SHA-256 b780a8ce6cb5e252…

MALICIOUS

PDF

106.2 KB Created: 2021-09-01 16:03:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b0c05ac2f9cc5928de4f012ba8b228bc SHA-1: 640f85f0d741d3328545959bd9c80608ec23a316 SHA-256: b780a8ce6cb5e2522aaa8091464b60a3e7fba278e8bfb354f8002410ac747ec4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure and embedded URLs are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/61276750076.pdf In PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/80839386855.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-3/20210503062018217808.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/xelulebaladazebigajixav.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/9069522273.pdfIn PDF document text
    • https://efnnma.org/files/file/sefitadaparogidujemas.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074766fbfb8a---fadogixafozovix.pdfIn PDF document text
    • https://artinterior.bg/userfiles/file/47237441699.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16070688425146---22364234416.pdfIn PDF document text
    • http://banghenails.com/upload/file/waxafewitujun.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0a6f602ce---66916853793.pdfIn PDF document text
    • https://kede.org/userfiles/file/gujobabolil.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/43413874121.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/jujuxude.pdfIn PDF document text
    • http://blissworldbeauty.com/newerac2c/userfiles/file/ropovav.pdfIn PDF document text
    • http://attlas.center/userfiles/file/88420968753.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160894c6486270---lesosajo.pdfIn PDF document text
    • http://1982thsreunion.com/clients/a/a8/a85c6617a93da1462bf6c3e7dda9c043/File/dotorawilopeparinibewamab.pdfIn PDF document text
    • http://phelieuviethung.vn/upload/files/xetaratonoti.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/76490d42cb8bf2336ae4424dd773468a/gewizusugenaxosu.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/5380647676.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/oqo8i8j2fge7rcp7gp1teqbp7o/wemivovexujisimutesiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=linda+perry+4+non+blondesPDF 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_off00013759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13759 19564 bytes
SHA-256: b4d730a8a00a027b33eb59d0fbf6cc544513e8a83c9d42c3c644c3e85284b51e
font_01_sfnt_off00016ac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AC0 10576 bytes
SHA-256: 8f2e4edb01ed41d3f870e8d9bed79698a1c6cabf88d4eea4b6c12b55930ffcb2
font_02_sfnt_off000182c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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