Malicious PDF — malware analysis report

Static analysis result for SHA-256 353dc582ceb0bff5…

MALICIOUS

PDF

85.0 KB Created: 2021-10-06 13:04:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4e46ecb1da22052d3604432af214cc38 SHA-1: f49556e3aef93d6565d238ddc24a46088142bf92 SHA-256: 353dc582ceb0bff5bea57de3a3f3638bdc29c3703bd9f58252f0717252447029
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The file functions as a link farm, containing numerous URLs pointing to various domains, some of which appear to be compromised WordPress installations. These links likely serve to redirect users to malicious content or phishing sites.

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://jshanwoo.com/ckfinder/userfiles/files/kakuvanoj.pdf In PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/a57a8ee249ea29b2f7bb0a146fb420af/36373080369.pdfIn PDF document text
    • http://xn--b1adrijbbb.xn--p1ai/upload_picture/80966186957.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/62525799261.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/31497671617.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79439980834.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/0afb500bbfe71b529850c11ae3872eb3/47636310479.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/15435731363.pdfIn PDF document text
    • http://azco.friend-match.com/upload/files/gulasodufozuma.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/91249882686.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/62076645182.pdfIn PDF document text
    • http://longbeach.ilovepokebar.com/uploads/files/8787622134.pdfIn PDF document text
    • https://foundationkuzmanov.com/files/menutemukexikopo.pdfIn PDF document text
    • http://swatimishra.in/uploaded_files/userfiles/files/suxutonefubobufowi.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/tezasukuvutilagovukox.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613694d435fc6---denaximaj.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/ginafofekopibelatutuliket.pdfIn PDF document text
    • https://www.gurgy.net/ckfinder/userfiles/files/lalavafeberalog.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/55057653744.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/2cd520c64544d3b18f8c832c8b4a58f7/kidozorunutak.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/menowetezi.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a26e8b083---36723121987.pdfIn PDF document text
    • http://ardeche.proximeo.com/ckfinder/userfiles/files/pibitudidudosokitenesodib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=three+ways+fossils+can+be+madePDF 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_off0000e326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE326 19576 bytes
SHA-256: 13afdeef8372e50dbfeda893a11c42edefc5d0b2754fdeb1e2d7419d4369b2d3
font_01_sfnt_off00011567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11567 10944 bytes
SHA-256: 3ac4ce72c0c31195b3cea773db93e48ca4a7bfb05784607d72f0d0f6ab23a225
font_02_sfnt_off00012e9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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