Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dde1df935a3ae8f…

MALICIOUS

PDF

115.1 KB Created: 2021-06-28 03:00:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: a29acc4763bab0fc73ac423a96173eac SHA-1: 4b99c01d37dc0cf502b4bff2cf930352775da1d0 SHA-256: 7dde1df935a3ae8fd39f2d63a6d4dfe37c0ce2e70c1425553de42e8862b98dbd
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 http://littlepearlbooks.in/data/eimages/file/mavufowo.pdf In PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/5082021de2228f1191a3aec173101eb5/goxejisafe.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d91a77907d---tunuwefub.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/n8vffgce42ns0u0u00s5f8iqh5/nutuvevixategodum.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/f872b3c664e8384213a9c0ff82f97548/5542041890.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/nufinafoxorowo.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/f4199b1974a0937ab4e1347dba0825f4/tefiniwupalinovifiri.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608632b8ecea0---32178698596.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/91166758581.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e37534458---63448998519.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///vokuzaka.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094823a49c30---54393981371.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/61537331456.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a30fbbb59e0---zegukisepotomejupe.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16077cf9012bb5---45031367265.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/kvicmqkvr0os8a20d7u1s0uuqk/488190607.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/dekaguz.pdfIn PDF document text
    • http://www.odnpoznan.pl/fotki/file/file/83482777054.pdfIn PDF document text
    • http://mmdplus.com/userfiles/files/20210604_042229.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c55caf29f9---69033467524.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/27300396506.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/botetu.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/15f63d199e864405001400e8b8897eb0/budubizamajusupimupa.pdfIn PDF document text
    • http://doreenindiatours.com/userfiles/file/sipoxejo.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd6db1ee313---venovopukovivo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=scheme+of+maneuver+example+armyPDF 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_off00016231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16231 10844 bytes
SHA-256: e78cfa34f91eb01836d52bfb23d2d58a13a994b5c3c76bbd42c1f9358451bea3
font_01_sfnt_off00017b1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19330 16920 bytes
SHA-256: d8417162a23aa9a060afd70c6ad2eb8b3b43d1bff0dec12533f329aa335f9607