Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8ff60c2eb3b8dfb…

MALICIOUS

PDF

92.2 KB Created: 2021-07-15 19:45:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 121436372ac9f99412432f7d835ab116 SHA-1: 262258d929537b13e6aae6fba839f18e56d4ab1d SHA-256: e8ff60c2eb3b8dfbdea39d05188648757108dfbdec87ccc66682a9cb3d3d206a
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, likely intended to lure users to malicious content or phishing pages. The presence of multiple links on disposable hosting and the use of UTM parameters suggest an attempt to obscure the true destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/6b70d547577189fb9e386bdeed477ec6/wipugabu.pdf In PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084057e6ce30---zamazusulasutakulixa.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/peximuret.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/17401779878.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/82756873690.pdfIn PDF document text
    • http://rabotatver.ru/userfiles/admin/luturogi.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/6401062780.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed4d4591a8---xekixuvawe.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/3tq99uk6b7gnnlq9vrrv8vr1p2/dumogugufuwuti.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/bfsi94hq2ien0466quhuve3hvf/32457351841.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/96a54931c01949cdfcdb36b63cce0587/gofezosupixugolugo.pdfIn PDF document text
    • http://saintthomasmonrovia.org/clients/a/a7/a774d5b45fc75aba9c6fcf07501e1e58/File/paxegubewuxoteduduzokujok.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca671534c8---ferematisu.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/7aa6228622d09248acac0445eb3a7660/sesilotupigudepisikusoso.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/5704jpe84iimht3r92ik81gmde/2488656056.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607822091734a---patosedunurobis.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608260e36a418---momasutatofetolino.pdfIn PDF document text
    • http://rilta.net/userfiles/files/52024677824.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021062412441073499.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f23fe7b612---11286183479.pdfIn PDF document text
    • https://datajournonepal.org/files/navafizobemosovegi.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d448qq3nmukh5o1kmar6qrhpv5/431334850.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c682e2bb6d---senexod.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/be5eed62ec75095b5fe43af46ee5d36f/45780074555.pdfIn PDF document text
    • https://eccdc.org/application/webroot/userfiles/file/79565711505.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=atoms+are+mostly+made+up+ofPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/968e846f05d15c1aab32be52e2625659/vipunepeku.pdfIn PDF document text
    • 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_off000104df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011cf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF6 10660 bytes
SHA-256: 235f8a13c8ecf03143d697ad3e43ace42b58b2d39b9b26c0aa503fa6ca430e6e
font_02_sfnt_off0001357a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1357A 17540 bytes
SHA-256: 30c90fdd4f3357b484ca6c368aa3a88a7aecf4a88574412f0844518ad21db124

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