Malicious PDF — malware analysis report

Static analysis result for SHA-256 d00a58a831b05e9c…

MALICIOUS

PDF

100.4 KB Created: 2021-10-13 03:05:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 361203907d62e5137889766bb4400d45 SHA-1: a4b0b9dc102503e54b0f64f85fe4e9894e164a18 SHA-256: d00a58a831b05e9ccafcca5bb288fe78acaea4949bf889fb5ea876209f85b2db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised CMS platforms or disposable domains. The primary purpose appears to be directing users to potentially malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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://u15.ch/ckfinder/userfiles/files/43286926064.pdf In PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16164163181856---22298763140.pdfIn PDF document text
    • http://architectureanddesign.it/userfiles/files/tosijid.pdfIn PDF document text
    • http://patroha.hu/file/jujukaleval.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/62832d94b94b31ec798af7393d924b63/24532689524.pdfIn PDF document text
    • https://promise-land.com/upload/file/keleguvakoxodofizemaf.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/jonokenulixepetivujep.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/74848365844.pdfIn PDF document text
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/bumefilab.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8961333fd---63259817398.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2d9550127---52436069660.pdfIn PDF document text
    • https://datenglagi.com/contents/files/towezujepepujole.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/nedasulakobotejif.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/rikajonisepeviziki.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/105d17f1ba3c8e31f2f218126197041b/25072621012.pdfIn PDF document text
    • http://dienlanhtruongson.com/upload/files/jugejenatafeki.pdfIn PDF document text
    • https://sma-dfgg.org/site/admin/file/68875833611.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150184791514---38180799124.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/1208036928.pdfIn PDF document text
    • http://myredm.ru/uploads/file/kiguk.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/82675939908.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/92772757912.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/fejagegonetelanazusimubad.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/pexewiz.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/47279292029.pdfIn PDF document text
    • http://darstin.com/userfiles/files/vanawadokelokowowe.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/RC0zOYPQW8A/uplcv?utm_term=eminem+with+your+picture+on+my+wallPDF 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_off00011bfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BFA 20324 bytes
SHA-256: 25edd7a4310d5919e8e2d7f50f84186bf3c368fb0c7670f0e602d5ab7e168792
font_01_sfnt_off0001510a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1510A 10756 bytes
SHA-256: b97c29289b4c8c377b5f0340d029a151dd7003bc823b1b8598add16560ccdcc7
font_02_sfnt_off00016996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16996 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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