Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3df0ee7b24de01d…

MALICIOUS

PDF

68.1 KB Created: 2021-09-20 09:02:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9f41bfca33f4bf388469df8f577999ff SHA-1: 8c4718f68567a015105199d44bcf6b80c24728f4 SHA-256: b3df0ee7b24de01da22ca829d9f133ea3a54bb15e1c07b25aaf1a6d72961eb9c
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious links, which are designed to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 9

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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.
  • 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://spbi.cz/res/file/29856754948.pdf In PDF document text
    • http://fioredda.com/userfiles/files/wenefukekesaviranizu.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f3f5d162c---tetajizepajutadejoven.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/xipoxaluwizegejixawifu.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/37897666121.pdfIn PDF document text
    • http://www.aaar.cat/assets/js/ckfinder/userfiles/files/sopikinosadelumado.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/gofajujazakumusorovuwux.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16143a1c8623f4---96586063566.pdfIn PDF document text
    • http://all-paca.com/ckeditor/ckfinder/core/connector/php/uploads/files/76971506703.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/73673163379.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/0365030d400e6b6bf3cabe0f0784fc38/35439130823.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/zixewabit.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/15845533708.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/87221902501.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/powedugutikuzapuxezifej.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-9-1/20210901070830943586.pdfIn PDF document text
    • https://geloracinta.com/contents/files/35882723221.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/12232132821.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/11104847209.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/56648469108.pdfIn PDF document text
    • http://airmon.hu/images/files/besoponaligabelarewibajep.pdfIn PDF document text
    • http://chandravanshi.com/userfiles/file/vunoxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=slow+motion+redmi+note+10+proPDF 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_off0000ae3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c64c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC64C 14688 bytes
SHA-256: 8d8f07b9f24d805745e173218222d21ac84bf1f8a2bc0862a763735738cfd41b
font_02_sfnt_off0000eb05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB05 10560 bytes
SHA-256: 101f822b0bd027e9bfc6858e2e281437d71a2c121840d1cd71f2ed925023d2ed

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