Malicious PDF — malware analysis report

Static analysis result for SHA-256 5368527c04935361…

MALICIOUS

PDF

74.7 KB Created: 2021-09-14 09:59:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6dd83686c4a681a7ef5d017fc043d964 SHA-1: 74fc267e5f251245d0a2862374c0d10d3d3d1c32 SHA-256: 5368527c0493536133ee24ef5032f35ff5eef8883dbeb28a60ce181c46739a31
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for further actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://laborke.ru/uplcv?utm_term=iptv+app+chromecast PDF link annotation
    • http://fpempresa.cen.es/userfiles/files/68393886574.pdfIn PDF document text
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/mozedowona.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/tikorililoxi.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/rivupipibupoxugi.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/kokirupedajaxamika.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/sifasegakutafivaxubuxenib.pdfIn PDF document text
    • http://advocaatindex.nl/images/uploads/jixolulopaviselape.pdfIn PDF document text
    • https://ourguarantees.com/userfiles/file/36436976946.pdfIn PDF document text
    • https://edusfera.pl/upload/file/88190528548.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/43084622593.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/39446095169.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614040003129d---57386754662.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/30461722665.pdfIn PDF document text
    • http://life-homeshop.com/asset/uploads/files/82956782712.pdfIn PDF document text
    • http://hiroshima-teishaku.com/userfiles/file/37019852834.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/66381883371.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/dabukebapufefuxomu.pdfIn PDF document text
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/penanojinovu.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2dbeec99d---jozasajuvek.pdfIn PDF document text
    • http://exosushi.com/uploads/files/pimotinewexadir.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132be584e102---91412455195.pdfIn PDF document text
    • https://kientrucqhouse.com/uploads/image/files/bavesetetiliwizaratizup.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/071cde49d18cf2a284a224e31820bd80/44021873033.pdfIn PDF document text
    • https://successalpha.team/upload/files/57964451463.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/35514337628.pdfIn PDF document text
    • https://akconta.com/uploads/files/tipakibidiwuxir.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_off0000c07f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC07F 10416 bytes
SHA-256: 33bde159b6cbe09d9534f3cb6db50e07b0127261aacd115f56cc801b8088b312
font_01_sfnt_off0000d82f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82F 17296 bytes
SHA-256: d5fde821536ae89265daf46ffb2a255f2c4ccec1eb48d310999b273e3be1c1c6
font_02_sfnt_off0001051a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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