Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c04c35d0a80af4f…

MALICIOUS

PDF

116.8 KB Created: 2021-06-22 13:50:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 8fe8f38c4331acf30a1edb1c737d88c3 SHA-1: 751a12f15b4cdc4f0a91c75738eb978cd00f0ec2 SHA-256: 4c04c35d0a80af4f549719b1300494c08d0f8940a788a750d5413bb1bcc923c5
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was detected as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The document employs social engineering by presenting a 'download button' lure, encouraging users to install browser extensions or updates, a common precursor to credential theft or malware deployment. While no scripts were directly extracted, the presence of numerous links to potentially compromised or disposable hosting sites suggests a downloader or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://webmenuplus.com/images/file/30782262738.pdf In PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/e60c8cedd6c027f886c894edc327a33a/81103647193.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b33b7b946ff---wilazenijiwenefakitidusaf.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/a3532c49cf3e6e6e16656d06d1cacd61/10961701472.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091a755e1b59---44140211381.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/48bd957e70152a88a16aca56a4c5259b/41319216650.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/fiwijamege.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bef3f3544ad---97310036257.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f0f11e6a2---tagofisugeferugululona.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/69870125873.pdfIn PDF document text
    • http://vieclamquantri.net/upload/files/26126368603.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ce89e6634---xinazunarunijin.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16084ced3dad67---1916336830.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdb64305cb---jisusumamifowi.pdfIn PDF document text
    • http://mooneyes.pl/userfiles/file/veketogunapixatexox.pdfIn PDF document text
    • https://biocoils.com/img/file/nutakesixotuti.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=building+microservices+pdf+githubPDF 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016cb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CB9 6440 bytes
SHA-256: a606a6dede3b99472d2ac97761204782646b5f75106b48d1abccbe9a99ca9a4c
font_01_sfnt_off00017cad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17CAD 5608 bytes
SHA-256: 659b935032b456f6a68785d2a9b8252339e9a0802833b68bb025904aedaad9dc
font_02_sfnt_off00018f9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F9C 2312 bytes
SHA-256: 7f18429775fe52727e0b5424a5b941d712c5f9950983184bf9b0f5e541eae370
font_03_sfnt_off000199e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x199E0 12232 bytes
SHA-256: d6f5d42931039fa5afc89d424785064b635dd21f4eeff89223d1a75d3228adb2

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