Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3b621d95ac0b88f…

MALICIOUS

PDF

100.7 KB Created: 2021-08-12 08:44:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: c01ce3c3ccb404a3e4ca567e9b9cee8e SHA-1: 401a0e27e6ec7756599893d0e807b4ca387f4a66 SHA-256: d3b621d95ac0b88f1fdd61ba5733afdd660ae69351b10acfbe87c2e840817346
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

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://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160b2828a7a4f3---zumemiroriwuvepusuxoduk.pdf In PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/7939d3e09fcd734c7afe4b3a650cb9d0/rujaxopuraj.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/56544567236.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16094039b53441---wukafonurut.pdfIn PDF document text
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/86979091555.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a1587edf3---69014114224.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1f3bddc309---84466393486.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/89414486385.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/17190413749.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/71024388802.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/f09127bf00a71404bd4b31c9d00bb1da/xidexevomulugaketa.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160848b136f008---sigalajopelen.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/norenekutavo.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/nif9nut842s2dq24e3bqct9t64/tutetenisuzaju.pdfIn PDF document text
    • http://erex.hu/upload/file/xininalalipojojupopite.pdfIn PDF document text
    • http://vizcsap.hu/files/file/34175301276.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607d843b9ce71---fotalulomofavujemifeb.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/43355471574.pdfIn PDF document text
    • http://perrymanreunion.com/clients/f/f8/f8644f0eb9578147d5589f75b8c3e300/File/47407302564.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/55441620825.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/u2mlv41gat3ghc1dvcrrpk3it7/tesilokebogobose.pdfIn PDF document text
    • http://www.insight-assessment.com/ckfinder/userfiles/files/33921479081.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/d6i2ljs8ce1caku65nmbl0p324/64713787703.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=comfort+zone+infrared+heater+cz1500p+manualPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/24751524504.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10810 20096 bytes
SHA-256: 5b0f6b59924ab59d922774145a32e8e95c8c5512d76d098df37a447726421830
font_01_sfnt_off00013cb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CB0 16064 bytes
SHA-256: f76835efc0f70b52b211676925d3c3919e6952eec6cd10f320d1ab287c5fabf2
font_02_sfnt_off000151c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151C2 11216 bytes
SHA-256: 8519afaa488aaa393a8eef968a3467c5112d7526d59aaa23c8d8ac507ce16f14
font_03_sfnt_off00016bec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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