Malicious PDF — malware analysis report

Static analysis result for SHA-256 cced5d0d39b35873…

MALICIOUS

PDF

84.6 KB Created: 2021-09-05 12:48:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0ca53fb413fb538015a67b0bd45fc751 SHA-1: 204fd125134bf3f020ef060758c8e6688dc8d1ef SHA-256: cced5d0d39b358736508704aae3796d37fd065ccd9dd95b103b40a660e1763d7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites. The heuristics indicate the presence of a link farm on disposable hosting and compromised CMS upload storage, suggesting an attempt to distribute further malicious content or phish users. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://quocteanviet.com/img-chamthi/files/kumuf.pdf In PDF document text
    • http://atol-res.pl/uploads/file/47600699952.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/vetezabezogexiz.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/45884421589.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160851e3a7f3dc---25200552241.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/ratifuvanatare.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/xakoreb.pdfIn PDF document text
    • http://emannsltd.com/userfiles/papojipezugani.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/nibodanikaxuwuwuda.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d81ed109f---20541362709.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/365120486.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/5262258677.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608986f5852e0---13867518734.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1611d0d2c64a49---puwevefeze.pdfIn PDF document text
    • http://asid.rw/userfiles/file/26232701397.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/pezemubanagobipabijuper.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c20b43af7---83289563980.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d569601ef---bedafakurogajuxokufe.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/61936971622.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/779ujailmdq9r6a67rgu5rfnp4/74126817986.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/pexelobowedidom.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16128f84559845---60399505645.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/70370332068.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/bobedixivikiwanipa.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/ei28c2aqn18hrn28tjullmerqd/46726187815.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/52599081000.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=overbridge+user+manualPDF 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_off0000e664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE664 17960 bytes
SHA-256: 715b7e10283e69191a51dd78f61babf2448a18eeb33f9df782a9ec47ed0f75b8
font_01_sfnt_off000114df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012cf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF6 10704 bytes
SHA-256: 00ebcc39a890fe578892105b6a6bf46103426d020168977c8c4184b473f527ab

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