Malicious PDF — malware analysis report

Static analysis result for SHA-256 77e29707978f5b35…

MALICIOUS

PDF

112.7 KB Created: 2021-07-25 03:24:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e0a8c6648611f12da8d8d678443d5bc5 SHA-1: a5fd20264f46ab95d7b1e4f790ae88cc6cfb1fe6 SHA-256: 77e29707978f5b35dba41c8ffb0b841ba542e8cabaf9ab22fa4e26183d1a77fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/7961f7d1f78fa65322608fe1a64e57c3/39172961859.pdf In PDF document text
    • http://china-zzld.com/uploadfile/file///2021060323332818.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/53460704825.pdfIn PDF document text
    • https://bulgariapools.com/contents//files/87877797884.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/zezilonoraxutal.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/20216252019376693.pdfIn PDF document text
    • http://sammyuriasproperties.com/userfiles/files/siwamewadasar.pdfIn PDF document text
    • http://didopack.com/files/jawezevuz.pdfIn PDF document text
    • http://phunhai.net/upload/files/tizajiwol.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/56539170284.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/89142386773.pdfIn PDF document text
    • http://calebdobe.com/clients/875189/File/98501850251.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name//files/sazulaxobogid.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a19a7554e29---62365396399.pdfIn PDF document text
    • http://55thocscompany.com/clients/62662/File/10816880637.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160982ede40373---87856482652.pdfIn PDF document text
    • http://africalegal.nl/userfiles/file/pixunagofowonone.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da84b8eb85---34687748282.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9dc40ba39---vutevimutizuxagi.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/bematexemaxuxuto.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc270264413---nezakunizi.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/vonigukeriz.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/045da82d535bd861851f74b2ec6e8744/66440828485.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/totizilenabifuxon.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb93f7ab3b---99434609897.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+fight+hand+to+hand+in+rdr2PDF 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_off000155c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155C2 10484 bytes
SHA-256: 20d4bbbd52b77baab6e4bfbc33d253a9a6a1b14a2d4424b5f1009e9d00f0d740
font_01_sfnt_off00016d58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D58 17596 bytes
SHA-256: d6e453502737291a3d764dd21ded78f66200980efa98d4fbc264370b8c49d7c8
font_02_sfnt_off00019bf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19BF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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