Malicious PDF — malware analysis report

Static analysis result for SHA-256 1683e8417758537a…

MALICIOUS

PDF

100.9 KB Created: 2021-09-09 18:50:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 08da5fc2f9232aa6be34a2a1239e4d4d SHA-1: f4d3b3fd2b5f282539ae4d6492ea865292b506ba SHA-256: 1683e8417758537aded6595180af624ed12b627ab664f17cee650e2e5bac72c5
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of these links suggests an attempt to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ikansambel.com/contents/files/kopamolu.pdf In PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7f91082f8---34371127256.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/3f8890a9609c3e567136e0657a55efe2/majekisi.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image/files/lizoxunebipumixe.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/bevosaduriliwetamilifize.pdfIn PDF document text
    • http://springgalleryng.com/Images_upload/files/mepegukijedizo.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/71390119997.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/jorezitebagedojiw.pdfIn PDF document text
    • https://hahapediatric.com/uploads/files/202109090301156413.pdfIn PDF document text
    • http://soyaksiesta3.com/userfiles/file/bonojatodamo.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/4962929270.pdfIn PDF document text
    • https://malmospelmanslag.se/userfiles/file/wasabufegivo.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/zokakedojijamafanug.pdfIn PDF document text
    • https://ozanetiket.com/TasarimAcarnet/serhali/upload/files/vebigixubixefuro.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/dogufivedivusonofotomigu.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lujobose.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/4d4mu5nr1ttq11g9crtjsht73d/80783239672.pdfIn PDF document text
    • http://klaaswester.nl/img/file/kokutumabiruvufuv.pdfIn PDF document text
    • http://mobitransjogja.com/files/88429594210.pdfIn PDF document text
    • https://jagamimpi.com/contents/files/82702952581.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161314e5f9d3cb---30782701086.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/silinal.pdfIn PDF document text
    • https://alummaswaja.com/yii/sdbalikpapan/home/images/upload/files/nesufulaxewarazobemetev.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///lakevotewiwa.pdfIn PDF document text
    • https://coluer.ir/documents/file/vilanewitowekawoped.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=mystique+from+xmenPDF 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_off000124f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F2 18708 bytes
SHA-256: 001b45551bd41b01c801412b533523e79e29f557031f6fc481fc78c0f88cebf3
font_01_sfnt_off00015531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15531 10624 bytes
SHA-256: e7462579749722cda364e18fba98ce3252929f15fd543ad659f87a6a6799aefd
font_02_sfnt_off00016d8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1