Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0a7e6071603a278…

MALICIOUS

PDF

83.3 KB Created: 2021-09-20 14:33:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9b5cb3f4c01ea904570f6d1e74fd41de SHA-1: 7517a52e546cae3f6ab78ac916f95e8b09d82760 SHA-256: f0a7e6071603a27879b0729373c1c90fcfad20fc77f00d4f1dcc700b0e1a0a7d
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous links to external URLs, many of which are hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve a second-stage payload. The presence of embedded JavaScript (T1059.007) suggests an attempt to execute code within the user's browser or PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 https://angel-juicer.com/FileData/ckfinder/files/20210908_4407E33F2C718352.pdf In PDF document text
    • http://sangjeom.com/userfiles/file///72653656577.pdfIn PDF document text
    • https://zakarpattya-tour.com/upload/6034099094.pdfIn PDF document text
    • http://abwrva.com/uploads/files/posozakazofulapevosob.pdfIn PDF document text
    • https://www.asoriofrio.org/ckfinder/userfiles/files/93371354912.pdfIn PDF document text
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/28999687536.pdfIn PDF document text
    • http://www.primariasantana.ro/uploads/file/puwolejegigejodu.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/93082447496.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/jikedanemufudezak.pdfIn PDF document text
    • http://www.jysunshine-hotel.com/up_files/file/zigoregaxezufogokapune.pdfIn PDF document text
    • http://managhantasala.net/mailuserfiles/file/gupaserujudawakuwidevijim.pdfIn PDF document text
    • http://associatedreclaimed.reclaimedoils.com/userfiles/files/60621330454.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/7516ff823bb5c951d2452c426e054b2c/70843324503.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/55384005441.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/4aafdd00f75139259a29e4b3fa9c2eb2/laburopixutowukoluni.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/ziles.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd7525d4f9---42725067212.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/43148183893.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/12911218663.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/161336b1209a8f---xedazekejuguve.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/7969534868.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/59848472875.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=nico+app+free+fire+downloadPDF 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_off0000e109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE109 10408 bytes
SHA-256: 0ec3a9868a4109616bbea136a628e882c07621052392178724fbc32b9d18005e
font_01_sfnt_off0000f8b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B9 18216 bytes
SHA-256: 95aa3cd923b28da8c0c87d14745b5dac767b84d773a7c21152bb624ce612b3a2
font_02_sfnt_off0001280f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1280F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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