Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b5b3d120091c572…

MALICIOUS

PDF

84.5 KB Created: 2021-09-09 08:52:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fcf4eb90d0905a518f89fd7f559dc6e6 SHA-1: 9b2198841254e53fcef21a70588d609dcaea613f SHA-256: 4b5b3d120091c572dd0b109f667d0a949ce6540fba4cc53ea86b958dd27646d0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also features a large number of external links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • 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.
  • 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://jujucuisine.com/userfiles/file/nurepumufirugivu.pdf In PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a45e4fbf2---89075522407.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/15560979587.pdfIn PDF document text
    • http://rs-entp.com/upload/file/10681350129.pdfIn PDF document text
    • http://knipia.com/userfiles/file/94281508377.pdfIn PDF document text
    • https://wangwangcamp.com/uploads/files/202109020431188734.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/jelebunamodevagi.pdfIn PDF document text
    • https://theurbanthinktank.com/files/fileserunoponosemokip.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/79441843714.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/96951578300.pdfIn PDF document text
    • http://webs123.com/userfiles/file/71464286160.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/32025846799.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c90062550---90385921338.pdfIn PDF document text
    • http://qdsenfeng.com/data/files/jinixofomipifupifofafosal.pdfIn PDF document text
    • http://amdind.com/userfiles/file/94668740910.pdfIn PDF document text
    • http://hig-hegmann.de/userfiles/file/69498446447.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369e765ff6f---ramotodozokani.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/tifigilu.pdfIn PDF document text
    • https://szabolcsipeter.com/userfiles/file/pebot.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613121251ae34---97591013763.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/28559413189.pdfIn PDF document text
    • http://exosushi.com/uploads/files/17797046455.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/93327113566.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/wonowo.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/juxagatugifigarove.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/64296846453.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/92273930131.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=drag+racing+mod+apk+unlimited+moneyPDF 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_off0000e398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE398 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAA 18164 bytes
SHA-256: 8bd98d8cb3c9639dfd80887502ca73d64646d055b1847422eac6f1ad4fbc931d
font_02_sfnt_off00012a42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A42 10996 bytes
SHA-256: e71510b3349c0e038aa6a2cfc51ba2a0c45e967e5fd874ecb0b448c8b5a13fab

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