Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ae33f0584db22ff…

MALICIOUS

PDF

82.2 KB Created: 2021-08-21 06:57:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dba6750984a191d81cbe093ef7bbe77f SHA-1: 8c04276175e07d4e98323e9766cc065fc466bec0 SHA-256: 9ae33f0584db22ffa0c0b19e4e9110087ce80e6a79b402698e4949c9a8401732
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content. The presence of multiple distinct hosts and the use of form-upload plugin paths suggest an attempt to obscure the true destination or host further malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1611fde44d0202---19099942670.pdf In PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0f6815249---muzaloxevazawa.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/cd55804bbb95ea6b4c6c94c3f0041a94/14031367892.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1bed05997---xoxak.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/5dc4cd4974308f72b8f961b69bab9a2f/vimanisijo.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/dimemixefun.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/9bc0853ffe54bfec76471d684e3839a9/betoxugazalala.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/guzarupedekufifal.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/gegav.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/80219970806.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/kidonasilej.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/qpm0l1clrouvqvf058kfkdc1oi/25972650505.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607154a06e808---mipigeputomevumaroto.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/30294347182.pdfIn PDF document text
    • http://jpbullies.com/clients/2/2c/2c827f09d77a589c2c5c7da8c033a3f4/File/nokotuji.pdfIn PDF document text
    • http://renovator.cz/files/file/perivorajilumejulabidigil.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/berenifag.pdfIn PDF document text
    • http://amdind.com/userfiles/file/11218038466.pdfIn PDF document text
    • https://diphong.com/uploads/22624569040.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-8-2/20210802055722362829.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/5962719f949330bed6ed198f319029c4/45684947259.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/m45151cdjeghjfsdujg0afp7s3/81343820673.pdfIn PDF document text
    • https://mo-space.space/web/img/podborky/files/86979878284.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=mpow+hc5+bluetooth+headset+setupPDF 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_off0000dc20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC20 17524 bytes
SHA-256: 58676a37074a8ba887fbca89795f0d0b485b2a4cc6622b849f3b7c41bd21f85f
font_01_sfnt_off00010a2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12241 10768 bytes
SHA-256: e9d00288501e913e0e040edb9b8fc4e9772820de1f2e39f7e384e3dfe8dfd765

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