Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dfe5007b640eb8f…

MALICIOUS

PDF

72.2 KB Created: 2021-09-13 02:00:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b0f5098ca84adb4de3ab063b88eb5503 SHA-1: f109410be3192fa8b4b4caeb9b3caf4069dc2677 SHA-256: 3dfe5007b640eb8f1bcaf621d0c369f9745c106d156c3bb3d621d21c6c53453e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards an attempt to exploit user interaction via links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://nomylo.ru/uplcv?utm_term=learnpythonthehardway+python+3+pdf PDF link annotation
    • http://czminghe.com/upload/files/guwikitisorivogoxaro.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/luwatikufatebusuf.pdfIn PDF document text
    • https://madeirashopping.com/userfiles/file/vabanel.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/92706944356.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/09/202109071744122189.pdfIn PDF document text
    • https://argumentua.com/i/file/24067148677.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/gejaluzedowopanakam.pdfIn PDF document text
    • https://estatecambodia.com/htdocs/cljr/data/files/deguwaguguje.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/3ftqco3sl5g5a6n0qbn4btj4hf/sulesunowilusamokalov.pdfIn PDF document text
    • http://stimatacasa.eu/userfiles/files/kavaxuwipetemeziwaponad.pdfIn PDF document text
    • http://kanomax-nsk.ru/images/xijejutukoxole.pdfIn PDF document text
    • http://dbexpertise.fr/catalogue_dynamique/file/17656269635.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/49772062524.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///sibonipukurefomaxonu.pdfIn PDF document text
    • http://olympusflights.com/files/files/vitigos.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/juwiwizorubuninekate.pdfIn PDF document text
    • http://ipai-bg.eu/img/file/44243276595.pdfIn PDF document text
    • http://tugrabilgisayar.net/resimler/files/82019208106.pdfIn PDF document text
    • http://nguyenxuanhuong.com/upload/files/43187287390.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/f20mip690oobff5qmvorti9k02/foxupedovifuvowifawow.pdfIn PDF document text
    • http://jtipartner.com/ckfinder/userfiles/files/fefusujorazuxoxes.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/finenelalatosizaditadeti.pdfIn PDF document text
    • http://cga82.com/admin/File/migijemadivudadoneninuve.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613db75e25aca---ziletixuwuzete.pdfIn PDF document text
    • http://seamacros.com/upload/file/89203808186.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_off0000ba6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA6E 15872 bytes
SHA-256: 460c544a08338a5da9e4c67023484c99a2583ff965d47bf80194fba99027b8d7
font_01_sfnt_off0000e2d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D1 10620 bytes
SHA-256: 631dee2dfff95c4754c8ef3735c31cf0f3bbb7d68c50a3ddea50674f1bace7f0
font_02_sfnt_off0000fb1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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