Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bbabcd1d3d64fff…

MALICIOUS

PDF

97.2 KB Created: 2021-09-04 11:49:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a879e938b0c8fce72e7ff21e6046b90b SHA-1: 83c2b5722a82f25965f4d059bfbe5235c2228f63 SHA-256: 0bbabcd1d3d64fff6974f65a79619fb775a9e2cadefd0fa8a76bfaa9b131e60c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating the PDF's primary function is to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://garglob.ru/uplcv?utm_term=crystals+and+gemstones+pdf PDF link annotation
    • http://fruhmann-elektrotechnik.at/tipusagoweki.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/sevupiwanap.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/91953732039.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/45638992510.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/d3163743d722da89d8ed9143d1d1adaa/48004558657.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2b2416786---98159206796.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/89694064642.pdfIn PDF document text
    • http://airsoft1.ro/files/file/70324058268.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/vidumovidutapoke.pdfIn PDF document text
    • http://drcleancenter.com/uploads/files/202108132212096997.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606d17726971b---jazawivixu.pdfIn PDF document text
    • http://eqletstalk.com/uploads/files/202108242343057152.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec985670c6---47021438947.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/lovofadafufufowedifaj.pdfIn PDF document text
    • http://sjccgy.com/userfiles/file/39375920762.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16088b8cf71c6a---80502306031.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/nelomedaboxuxowinu.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/sigeropafimojabur.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/86993d94f4e177cd4078a418be382427/kisepemefolewitebego.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/nugudufolofekakowodira.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/rlue8v4tmgt2rq9fmu1aqa6mvn/tezibiduputadusavikojoj.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/57268403132.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/medawalu.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607013fc94abc---mizilu.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/84825031537.pdfIn PDF document text
    • 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_off00011402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11402 10892 bytes
SHA-256: 4387e8cc1ca58fa790aa328009cae26630db476f01cb332f303669a3b9fe2ed9
font_01_sfnt_off00012d06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D06 19064 bytes
SHA-256: 05eb4f852a3e5206b029205532e9a00fbd0c3ab53fcfb53c711d659d32308d3a
font_02_sfnt_off00015eb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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