Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b17959f8fa4d01c…

MALICIOUS

PDF

85.7 KB Created: 2021-07-20 00:52:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8cf870304d68496f5c0deb9dc86b7672 SHA-1: aa9d61cc834ba4e519b5f35ba545d2b0e615944f SHA-256: 9b17959f8fa4d01c8641a649191d3d7c374fc9eb2c1635e103ab29172139a00c
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple URLs hosted on compromised CMS upload storage and disposable hosting. This behavior is indicative of a phishing or malware distribution scheme, aiming to lure users to malicious sites. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://ks-puyuma.com/CKEdit/upload/files/bapisinafuzageseno.pdf In PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/932dc18bc08e14aea5a8afe5c180ca71/4266053170.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/19457519110.pdfIn PDF document text
    • https://digireg.cz/upload/70231580386.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/htc3tj1oo50ns529per19ca2d0/40456503275.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/56937603003.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/f74bd3bfd4432971bd27b683f74b093e/loxulesa.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/viniruvem.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021053012013443.pdfIn PDF document text
    • https://sambelteri.com/contents//files/68272044587.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871652c5871---ludesaletixaban.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b81618f952---kemuzinuduxilazofejuzatu.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/341196575.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af8a235f3c6---buzaxifirarobefewiwulup.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608b60cd6290b---50927925124.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/dazamezenozuxugazuliz.pdfIn PDF document text
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/91ac2e18a4bfc5260ffe42fa09e96ee1/60331845905.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/95e1668868a6ac55dc1c04f278a66560/wapudizove.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/6uu5j5rpatu01rdh1u0bvdhmd2/porototumajorejebimusige.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c36f96ab4e---nadinoti.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/26347057381.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16089c3c87bfb8---saxosukekup.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/49261592484.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=what+does+que+onda+mean+in+spanishPDF 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_off0000e8fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FD 18568 bytes
SHA-256: 63abd03df849a9cf400a309fac06204ed283d730b52e482f072a44fa0f730345
font_01_sfnt_off00011927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11927 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001313e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1313E 10752 bytes
SHA-256: 174a83934149dfd69ec9ae4e5c2ba9cb9bc9b07f1564cb4f13dcbb343e1cb113

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