Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbf74793358d134e…

MALICIOUS

PDF

62.5 KB Created: 2021-09-27 12:23:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 12ecd30a11f9ab1dae55ac89ffe607a4 SHA-1: b1ed16a8cc09c71f60c3c0a0e657427f4251b356 SHA-256: cbf74793358d134e1ffc298a03a34f1e9c6a5022fed6f19c4202319a5c80e258
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to disposable domains and compromised CMS upload storage, indicating a link farm designed for phishing or malware distribution. ClamAV detection and ML classification confirm its malicious nature. The presence of embedded URLs suggests an attempt to redirect users to malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5428

Heuristics 5

  • 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
  • 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://allytemp.ru/uplcv?utm_term=tasker+app+uses PDF link annotation
    • https://suruburi.net/mm/file/22749999891.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/kagijixupujisi.pdfIn PDF document text
    • http://p-jtech.com/userData/board/file/posigogasemoto.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16143f8928ef45---velutafarevojukis.pdfIn PDF document text
    • http://3sdent.com/upload/files/16959121704.pdfIn PDF document text
    • https://jucariicopilasi.ro/app/webroot/files/userfiles/files/xigalopizezagemoz.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/pemiwupibuxez.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/refalafos.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/85112211931.pdfIn PDF document text
    • https://thebottombillion.org/business_school/uploads/file/83287538890.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/58326845167.pdfIn PDF document text
    • http://yotlist.com/uniformkontakt/userfiles/image/files/fonuposixupagupiwimixi.pdfIn PDF document text
    • https://goldengatetaichiqigong.com/userfiles/file/sakesadedupu.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/71687949456.pdfIn PDF document text
    • http://baovevietnam-vnss.com/upload/file/57724795556.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/934f3d8f6b212af4726b84c3bcf316a6/25518889400.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/jadofadanowovelaj.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e50e271a17---61686250027.pdfIn PDF document text
    • http://vsrru.ru/userfiles/file/waxileporizar.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16146a97051e4b---xajewedepe.pdfIn PDF document text
    • https://benmoonpharma.com/userfiles/file/xixiwig.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d4454460b---31598769415.pdfIn PDF document text
    • https://rais.bg/uploads/file/dadifolitigumaj.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB755 9940 bytes
SHA-256: e32980ff9ee662e85b15920b6a1ad64304540fb5aee8f239abfa306f4bf928a1
font_01_sfnt_off0000cd78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD78 17000 bytes
SHA-256: cbc2de00da1a0688496ff31bac846de571d18d26e79cbda5666e59ac03637367

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