Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7579fb5fd12532d…

MALICIOUS

PDF

82.8 KB Created: 2021-09-15 06:02:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a42e998b39aa1d3d5752a49a1de660e4 SHA-1: 0fd07bb21c6bb88e0e17ffcb351d58b5662d0d81 SHA-256: c7579fb5fd12532db5f21d1073880b9d3a47a0f16d90723ee985c1bcefa2485e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond what the heuristics reveal.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • 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://onlineadda.organicemall.com/ckfinder/userfiles/files/ruxosaginutasobexu.pdf In PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/27346360129.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/99074487993.pdfIn PDF document text
    • http://factorycontrolprojects.com/userfiles/file/vopixekebebonulud.pdfIn PDF document text
    • https://redac.ch/upload/85624838163.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/bewawisaw.pdfIn PDF document text
    • https://oferta.lt/i/File/30074669341.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/86376339638.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161414fde59220---vudoputusavowudeguwag.pdfIn PDF document text
    • http://investgeorgia.ge/userfiles/file/42983197443.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/12585198125.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/ririrawalu.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161412884bb150---79343961788.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/zidexu.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/1c3dhn44hap998bunv8hl9e391/xexunonetesidofifa.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/44468342107.pdfIn PDF document text
    • http://opuspointpartner.com/ckfinder/userfiles/files/vusineberivasebipegi.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141399d1ab32---xiwebar.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210907215339.pdfIn PDF document text
    • http://hotelpancharatna.com/assets/userfiles/files/wozub.pdfIn PDF document text
    • http://music-summer-courses.eu/upload/files/97719411065.pdfIn PDF document text
    • https://perfecthospitals.com/ckfinder/userfiles/files/wusadutakozidu.pdfIn PDF document text
    • http://ebus.cn/up_file/file/zoril.pdfIn PDF document text
    • https://aarushimukhwas.idealviews.com/userfiles/files/kobamuponi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=buy+instagram+likes+trialPDF 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_off0000dcf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF509 18624 bytes
SHA-256: 802a4657a26be080920d2319c7a91bda717c0c8fa252564cb5f1106f175b70a0
font_02_sfnt_off00012552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12552 10692 bytes
SHA-256: 68a3bef0dc0aa5b9e54d6b228b413c73b4e29fe004e3b6df9697c8963771c329

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