Malicious PDF — malware analysis report

Static analysis result for SHA-256 efd692f2e1ac0edb…

MALICIOUS

PDF

81.5 KB Created: 2021-09-01 12:53:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e998c306c163ad1f8252214b911a95aa SHA-1: 8863bd03cb58ac9e53676d28d7592a4f089210dc SHA-256: efd692f2e1ac0edb7f45dd19c151740b15f7e58c2eb675352a60ff182aff08f9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or are hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://medvor.ru/uplcv?utm_term=free+lp+on+sims+freeplay+2020 PDF link annotation
    • http://www.euro-fly.eu/userfiles/files/renanivewatagowujum.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/87969527790.pdfIn PDF document text
    • http://slstudio.it/userfiles/files/notinamaxulobibaraleviv.pdfIn PDF document text
    • https://kaimano.it/file/41865594582.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85f8f6a45b---95791401005.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/18844754956.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/gikitevevisalonenixi.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/rovivesuduvelofen.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/63184683967.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/juzoxawekokasojudugo.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/2099ad3e7a90a148a479b45ab5b32515/zixibatarot.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081fc2b7c0a2---30585344141.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/24241241825.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/47564547469.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/4fd9b542ebe37e0a527e43dbc1769f85/pibopisowuf.pdfIn PDF document text
    • https://medpressa.ru/files/file/1574298548.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/43245500230.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/83203002916.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/gusisazaxilexak.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/24255050040.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160973be336319---61268414064.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608623f38d72e---42761942822.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/gizibopibaw.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/pazatage.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_off0000db69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF380 10752 bytes
SHA-256: 605e6e5d15903615d6ff98c40dcd49bf7b39dc992f2d06d5393eafb57b0b4d7d
font_02_sfnt_off00010c3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3B 17052 bytes
SHA-256: ff15e933f806bd86905816d66665517833157a54b2287c196d8f982eb7f793fe

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