Malicious PDF — malware analysis report

Static analysis result for SHA-256 b638a65ebfe602f4…

MALICIOUS

PDF

87.2 KB Created: 2021-08-17 17:20:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ad0e1ad9eea7a049cbfc4e26b13daf20 SHA-1: f3b08df6624b3f513ba91d309da13de509c3007d SHA-256: b638a65ebfe602f4300024691df313e4a7613445dede340d3e8f0ac429db4223
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a link farm pointing to multiple websites, some of which appear to be compromised CMS uploads. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates that the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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
  • 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 http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1608db6e221e58---xobuwujamepodiko.pdf In PDF document text
    • https://sarvodayasamaj.uk/upload/files/nejiv.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/76015527164.pdfIn PDF document text
    • https://manenshop.com/upload/files/99178572013.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfae555b14e---6093597583.pdfIn PDF document text
    • https://antae.be/app/webroot/uploads/file/81890503078.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/vukurixemutukuxisu.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/2a157ccc26d7e0a2a6333c606d824804/81821853459.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5cf22564f---dififaxitaxidesedepunab.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16087ee372e376---21907850679.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160abdcb8b8856---90149213100.pdfIn PDF document text
    • https://tanthuantelecom.com/upload/fck/file/22675378151.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/a3cd0a32ba7d152583fb1805cf77961f/jipijatakoguzitaku.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/ae287e501050948a50cfde97658aae93/39957922383.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/t7l0nmdkp4okfdkl6jdpitdei2/zaliriwekureladaxolowemo.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/vixojomig.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/suvegifofipaduguxib.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/f42a337dcff941a5546ca1546588bcbd/78746963823.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/gumit.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/nufewugijavasezekek.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/v3e6itc4ahcenh7nrqhtj89b69/5395238806.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__60CEA1D1EF2D6.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/18752424883.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/leniviruxapusosefodavo.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/fd8b78dc1a26f7331213949e65bbf6c6/jutodiresogafilobux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=rangers+ordem+dos+arqueiros+2+pdf+baixarPDF 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_off0000ecb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB2 11352 bytes
SHA-256: b438d3d67b88a4786bdda2b1049e04529e9ed640388a176b6998b38cf9724657
font_01_sfnt_off000106b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B1 18808 bytes
SHA-256: 3534dbf4a9e4c330c3ebdb99b30b45902abc6b5baebd24938c83d19b1af53941
font_02_sfnt_off000134f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1