Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bddd0806607e483…

MALICIOUS

PDF

89.8 KB Created: 2021-07-01 09:34:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b911969983b7189af4e907077462396f SHA-1: 0ec6bb208c18fb22c66b3f3c081790736736bbd8 SHA-256: 9bddd0806607e48364a137daf0deb719170c80cabb7731248245f52b813569c0
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised CMS upload storage. This suggests the document is designed to act as a link farm, potentially leading users to malicious websites or phishing pages. The ML classifier strongly indicated maliciousness, supporting the assessment of a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • 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.mii.net/wp-content/plugins/super-forms/uploads/php/files/728b5a8115e13df53109aeffb2b5519a/lepepatonasekoluk.pdf In PDF document text
    • http://consulcongress.it/uploads/assets/file/1402568883.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/d8c2fae7bba3fded6327e2097c4eebae/31134247792.pdfIn PDF document text
    • http://shopexpert.com/app/webroot/files/userfiles/files/9425974206.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/sukodiwelipeluzosogon.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5620de630---fidupitawegaloziwo.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/4b6eb5bad379671e55873441a0f12aa3/58038849463.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0d3a76e5d---75206989452.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/ebeadce17d0b49b0db35bd2375a1d7a6/ligoxogewivonupin.pdfIn PDF document text
    • http://lbtech.kr/upfile/files/jovajofumapodeb.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/batubekewasokip.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0aa45baa4---15170766642.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7b80d0752f---fikamulatar.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/d6ca3bb2f82c75bda17593aad614a072/kuwevewejokuf.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7e546d681---bafaleluna.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/35014055542.pdfIn PDF document text
    • https://aedwea.com/upload/foto/90531000114.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/c1fc00dbb07cb75aeec0eae829be45ba/43646387584.pdfIn PDF document text
    • http://hollywoodterrace.org/clients/863344/File/80722372808.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2ecdc5437---71961869831.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9b3d2ae4a---donodusonisufexavoguboj.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c961c370a1---nesalibamewufidevava.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/840336ebd2723ee68bb37e248dc53ca2/sifujotelarafu.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/kipadidorekaz.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/b3tu1iqlt0rteqkgrts6bbedbb/32207525059.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=section+1+topic+2+properties+of+exponents+answer+keyPDF 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_off0000f7a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A5 17344 bytes
SHA-256: 30ba11867e1ad926b0bfc77811cc956478e84905141703ca5788c9f08e10a809
font_01_sfnt_off00012575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12575 11068 bytes
SHA-256: f00d9839af9dd9f9d4bd66a35280ddc2d773bf2cc30c627bc6487a2ff346ec57
font_02_sfnt_off00013f92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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