Malicious PDF — malware analysis report

Static analysis result for SHA-256 2157b439735ed7af…

MALICIOUS

PDF

81.3 KB Created: 2021-09-13 11:49:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0c2edb7c72210d46591d449d0fef7f30 SHA-1: fa9f9b3ba6b7c22b69108a95717c7ff7a72f10af SHA-256: 2157b439735ed7af3b1fd9ff6fe7c7985e33abb7deb49a4513457ee3751a928e
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and multiple external URIs, some pointing to potentially compromised CMS uploads and IP addresses. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document's intent is to trick the user into downloading a password-protected archive, likely containing a malicious payload. The embedded JavaScript and the nature of the linked files suggest a downloader or dropper functionality.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://zhfangyuan.com/uploadfiles/files/kaxomowutudevaje.pdf In PDF document text
    • http://jingmingtai.com/filespath/files/20210909132018.pdfIn PDF document text
    • https://lufty.cz/UserFiles/files/pivem.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613efd479f16b---telanofusipurimisanewotu.pdfIn PDF document text
    • http://factory-01.com/js/upload/files/79197469971.pdfIn PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/82980146196.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/1b254128c2415a340a319928a8e0ad00/mobutixagabosewexezafesoz.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/pevukaxomixuva.pdfIn PDF document text
    • http://designgaleria.hu/userfiles/file/pasolobikopexajobugamin.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/22783653761.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/lazurefiz.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/gatexeromuzi.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/kapoxunopusoxafirikew.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/44539026172.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/94499182554.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee193be202---36751274576.pdfIn PDF document text
    • https://www.stock2morrow.com/ckfinder/userfiles/files/39004549707.pdfIn PDF document text
    • https://groupunsur4.com/contents/files/72822956724.pdfIn PDF document text
    • https://bawauang.com/contents/files/sefagixeded.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/1d6c2fa9d7035a2c8e9da45fb20caf21/43793466535.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/83888293611.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/nojowexinowenixujotote.pdfPDF link annotation
    • https://netiko.ge/img/Data/file/29331344544.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+open+password+protected+zip+file+in+androidPDF 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_off0000d33d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD33D 19696 bytes
SHA-256: de44060d36d4a344b929a33a38591fe068a5f7df13a8a96d4770ded043f0c5cc
font_01_sfnt_off00010644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10644 10752 bytes
SHA-256: aff0121eeabe9ff176c48784e591cfe1eb1d62e986c37446c385a179061f75bf
font_02_sfnt_off00011f32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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