Malicious PDF — malware analysis report

Static analysis result for SHA-256 580557f03633a3c6…

MALICIOUS

PDF

84.5 KB Created: 2021-09-03 18:24:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f3293c6d765f707cbef9d0fb887903b0 SHA-1: c122f8c0454695ab409a77c28215d129d153813d SHA-256: 580557f03633a3c69ad1db8597f79fb903a4f1d794354643f6b95d8fb3ef988e
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple external URLs, some hosted on compromised CMS uploads or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to exploiting users via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://ineke-ott.nl/keramiek-beelden-imagesfile/70046143049.pdf In PDF document text
    • http://jsdarvin.com/files/16884565660.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/t0a0qksjg3426igmc71t79gil0/27326279120.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118834d0cd3e---87296680761.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/18754726541.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e454dc5f55---58259960485.pdfIn PDF document text
    • http://flexa.cz/docs/file/lepodesaponi.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/ngomujf5im53vqdijqr6uka6tr/pepixafavadeweditina.pdfIn PDF document text
    • http://ausafe.net/images/art/files/70831121593.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/2dg35un6ej31hd0igotca9ava1/87534405166.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/wesabewevod.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/dulevupefan.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d5545a3d370---gavezijapomeriruzubole.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/051ff176ef7de5bf597f6bf2fcea0abc/63248032042.pdfIn PDF document text
    • http://healingpawswisconsin.org/clients/a/a9/a991db820639e3552774ed9a746c1e3b/File/48959639809.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/bo04d9fvlvk3i2oimr0hq716lf/kulukuletijajanidezetik.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/fimidawiruzidesixiwuz.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ab4adb6e7a---42986227966.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///202105312757_505018275.pdfIn PDF document text
    • http://mrukseo.pl/userfiles/file/33371942828.pdfIn PDF document text
    • https://botroul.be/uploads/96569542289.pdfIn PDF document text
    • http://sitarofindiamd.com/userfiles/file/gizupofoveje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=black+and+decker+coffee+maker+manual+cm2020bPDF 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_off0000e463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE463 17968 bytes
SHA-256: 371905b06d14257ad4f3d5a1b1e53ca66b2c11c887b9f59e436f86436138d4b3
font_01_sfnt_off000112af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC6 10908 bytes
SHA-256: 3e08b7b35aed07dd27725a4f326426efb428945cd670db7aaf81d429464a9aca

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