Malicious PDF — malware analysis report

Static analysis result for SHA-256 bca23af4e11f9f66…

MALICIOUS

PDF

87.7 KB Created: 2021-07-25 19:30:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 50d1b0d8c25a84c3722ea1145a38992e SHA-1: 7613901ebe79a23bcfb2ef7815286d2e45374d5a SHA-256: bca23af4e11f9f66c1a8431831c4e180c178adb9867072c91f1b43cf7c3c6a45
164 Risk Score

Malware Insights

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

The PDF contains numerous links to potentially compromised websites, suggesting a phishing or malware distribution attempt. Heuristics indicate a link farm hosted on disposable or compromised domains, and a ML classifier strongly flagged it as malicious. ClamAV also detected it as a phishing trojan. The presence of a 'download button' lure further supports a malicious intent to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • 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 http://abw10thstreetne.com/uploads/files/82034972492.pdf In PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/2glh3t7gpbmdufs1k4vhbs6pa7/kutonupoxupawupugibopezi.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/58933738972.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3b1b0d057---98284479011.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b5cbc1032---kokuvupedenupamowedog.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/bixukifaxave.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b061416976---xogivo.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/85682652784.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/638689f0c7eba0b35805eceee8d508a8/61815319763.pdfIn PDF document text
    • http://mmdplus.com/userfiles/files/20210724_012815.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/60954195202.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a000ec577---wibexawubasemafege.pdfIn PDF document text
    • https://chpcentre.com/files/file/96684751486.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/5ae750485ab04ed1dd6569b8e9236111/tudeta.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd742a6198e---ruxokanej.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/6406c4faea0ace242c1e5766fe75b450/kuluwolezoze.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/4ba9428e255562edd2ce3bc4d31bcf8a/90632946385.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b3a2295d1---walorotiganaruzavona.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/kegixobalowajuzojore.pdfIn PDF document text
    • http://tatnhapkhau.com/ckfinder/userfiles/files/wefisop.pdfIn PDF document text
    • http://bscartridge.com/pic/tomutojetilujotisowepesux.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e09ad60c09a---2578907674.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=what+does+the+nine+circles+of+hell+meanPDF 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_off0000f4e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E8 16752 bytes
SHA-256: e04c4cddd2088db18ba42c5b1db945eb7cf5b5a49e662501f7800197de758ec7
font_01_sfnt_off00012080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12080 10732 bytes
SHA-256: 5a314516bb34255301c8c53217dc1907b4834d95f79614548f92b614198d0848
font_02_sfnt_off000138f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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