Malicious PDF — malware analysis report

Static analysis result for SHA-256 98f3e0642e0f6fe8…

MALICIOUS

PDF

69.3 KB Created: 2021-09-25 04:00:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cbb4f154bf5b0588e4c86d32f1f7ca16 SHA-1: 4c73fcaab3b6f5b48321ec2184ff4bccba7536e3 SHA-256: 98f3e0642e0f6fe878e3c55293fd2f15e864ab7b244e5153d3f06d89a7270f12
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. Several heuristics indicate that the document is part of a link farm hosted on compromised or disposable domains, suggesting a phishing or malware distribution attempt. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8136d572d---73144789182.pdf In PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/a6f4bce96b7e77750db62c5994a255cc/29724145945.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/99968969711.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/rowafebununojusadizu.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16135aced52cbf---95759316322.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-9-9/20210909141149511231.pdfIn PDF document text
    • https://lsv-wittlage.de/ckfinder/userfiles/files/wexexa.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16147212a69aeb---seluziwupobiw.pdfIn PDF document text
    • http://at2apigroup3.com/contents/files/reseratudugar.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/91573888287.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/revelelevupanevag.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/wesotonivalo.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/guwubujuluxar.pdfIn PDF document text
    • https://matricula.arendic.cl/files/napikepulanizerose.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/mudozi.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614dd2a6ca1cb---75881607825.pdfIn PDF document text
    • http://hoaphathotel.com/luutru/files/temijorubibutoxetixuk.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614696a1188ec---xotuxol.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/sb5d82s963tbni41d4umhcm3ef/noxediwupibitowigenenod.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/fumagekunekugudidozuguja.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161442eef11f99---lovekovefadajotedojifir.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/jobofarukizeroxudunigupur.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/kurixeraxur.pdfIn PDF document text
    • http://cl-pub.com/files/files/wuwizetivuzakorewil.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/87665419476.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=the+movie+123PDF 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_off0000b198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB198 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9AA 15592 bytes
SHA-256: 0768756aef9a4364c9549899f96b85ac32d3c2719a39451e9c00e3c318356c25
font_02_sfnt_off0000f155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF155 10068 bytes
SHA-256: 2e17d8768c299674e3ab88da297028ba055965b90011274aed6414ec72c0647a

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