Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a5a7dab278b15a6…

MALICIOUS

PDF

69.2 KB Created: 2021-09-07 10:06:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c85a2f5be2b88d94f61970d670923408 SHA-1: 1502121585c529dde738c80fef6786a7cd29975d SHA-256: 6a5a7dab278b15a6cbd335cbe1131dc2aa7e55da665b3b12905d5471c298ab14
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://cambresisemploi.fr/ckfinder/userfiles/files/larususajasevovubizafedi.pdf In PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160888c6424730---vipapanafakes.pdfIn PDF document text
    • http://aspbae.org/userfiles/file/58602662884.pdfIn PDF document text
    • http://rulada.by/upload/editor/files/85807896453.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/vubuxajo.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/pipisimug.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c2cc36c4c01---91213168113.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/vopavilaw.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/porevuduporaligesudepos.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/23436917738.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/mikokofi.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/27580396159.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/65728699920.pdfIn PDF document text
    • http://hncastlecable.com/d/files/tasefasimisivapedixuzi.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/f07b723d1bf2c0405b398fc6aa86aec6/75695932769.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/53t3hn8hqfe8urs6mha0vd0bb1/31210961911.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/77084330618.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161184cceecf47---javusuxo.pdfIn PDF document text
    • http://suacuacuonthanhhoa.com/upload/files/wexamop.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/92798980182.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/69139908981.pdfIn PDF document text
    • http://mountcalvary76.com/clients/9/90/9062e1c9f2360b2cedac6e2854879500/File/gavexoridine.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/29612397652.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/simadinofosemiwigexigik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=kid%27s+box+6+second+edition+pdfPDF 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_off0000b1e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F9 10740 bytes
SHA-256: 36e3dadbbafa067b9ba2711bbb733ea3f84e630c1f1ef6e41528c7f873e1d7e8
font_02_sfnt_off0000e29c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29C 14724 bytes
SHA-256: 8cfa6a11ab98f4f07dd6f3ab2344e928c9b922fbebff1ac9d84fd1cb72f27ad4

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