Malicious PDF — malware analysis report

Static analysis result for SHA-256 b472dfc1d1d61ec3…

MALICIOUS

PDF

90.7 KB Created: 2021-07-08 07:23:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 678374e8121df6a2ca53bbfacb3d46e0 SHA-1: ab52320eefe597125d40e2e5a8da47db01a71af2 SHA-256: b472dfc1d1d61ec39b4f80dd5606740b3dd6c3bfb8a76b6c3213c2d0246f1e8d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF document exhibits characteristics of a callback phishing or tech-support scam, as indicated by the 'SE_CALLBACK_LURE' heuristic. It contains a link farm pointing to compromised CMS upload storage, suggesting an attempt to host malicious content or redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c943b115cf---moxenexofitatarelupofu.pdf In PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/4b1o1q3kpv01njv3pta1b0j1dr/2562659072.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa20ab9119---nanuwebekipuzobi.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/27a50287ce787f524f3bfb9d46eda922/35936715929.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c85504d6621---vojexegewisebo.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/62923675330.pdfIn PDF document text
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/a78591d7a7ed6b0ce06229e6c3725465/fapaxasajijadoj.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ef964aafc---91019851593.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/tazuvit.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608470c32d8ac---gipeketuxajom.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ace65bde975---58573857156.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b357c1b698---19226843355.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160724e35a4807---devovenovob.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070928f39b33---soguzo.pdfIn PDF document text
    • http://wenxuezj.com/images/File/titexixotoxafukigawozawu.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/simabesav.pdfIn PDF document text
    • https://pasarantogeldua.com/contents//files/pepifofeto.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/18663126435.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/zinikapolemidefimegemag.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210518104522.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/xusovisulaxelomalerasuga.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210518115940.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=catecholamines+are+produced+byPDF link annotation
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/jiwugemilaxezuvimufo.pdfIn PDF document text
    • 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_off0000fbb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB6 18224 bytes
SHA-256: 02faabae0157a727a86bf1abd9abd265938b3bff79987b913fce42706b438a2d
font_01_sfnt_off00012bf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF2 11164 bytes
SHA-256: fd589902aa49bec22aea5c3ab3b06bf5b147bef52eda406a99ba45b5e8e85c0f
font_02_sfnt_off000145a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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