Malicious PDF — malware analysis report

Static analysis result for SHA-256 6961a9dc15c59cce…

MALICIOUS

PDF

97.7 KB Created: 2021-08-30 16:06:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 23fe522324a57441af2d3b41f78f3f3e SHA-1: 8b5372ca7c39c023c97528ed44c17ad39b4cd977 SHA-256: 6961a9dc15c59ccea3ec2ffc6fe973fae70b1eeb95784d9b7194acc77341c05a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pisangmanis.com/contents/files/64304765049.pdf In PDF document text
    • http://wadsoda.com/UserFiles/File/sukonejivawusasarivowutez.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/gigabokidopat.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/roxodexevexevizilen.pdfIn PDF document text
    • https://dafelia.com/files/pixurixosubirin.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/sinifofevawesumig.pdfIn PDF document text
    • https://mtmhomeschool.com/mycms/uploadedimages/editorUploadedImages/file/14335438499.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/f3021d634bb43f6a18ba14cd1330e000/54143128457.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b5832b106e3---30819887581.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee3c828287---zefezobu.pdfIn PDF document text
    • https://zold-kommando.hu/files/migud.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16083a8b7a8d69---69684560554.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073653678efe---jefoxuvojanitago.pdfIn PDF document text
    • http://puppies-4u.com/clients/e/e7/e7f09595da74c05d2059c741134300d2/File/wejenobogawisusuvizaje.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0f2348a42---wavub.pdfIn PDF document text
    • http://dfanchem.com/upload/files/vonos.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccf7981a800---37524836790.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/58164629584.pdfIn PDF document text
    • http://istrouma1971.com/clients/9/9b/9b88b062b8d6af44b28e209fcb06d7d5/File/22283736926.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/relavenibigetibi.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/gc5hj8nb5gstjo7iefg338jp5d/20880586741.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/sabc0m64bbkm4g4kfvgpfn12r5/sokomi.pdfIn PDF document text
    • https://cubic.is/userfiles/file/lobafixixo.pdfIn PDF document text
    • http://greaterdeliveranceministries1.com/clients/61527/File/87609983125.pdfIn PDF document text
    • http://trungnguyenjsc.vn/uploads/image/files/76446234170.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=witcher+2+quest+listPDF 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_off000116ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116EA 19440 bytes
SHA-256: 9e452abf4b83686546f649047d6786ac777ceb6d653ce6b25ed9ad320ecb4184
font_01_sfnt_off0001494a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1494A 10300 bytes
SHA-256: 72c26f81399f1e5f2a30a773676f7c155f465fcdc382899fbbefca791368e9f2
font_02_sfnt_off000160b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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