Malicious PDF — malware analysis report

Static analysis result for SHA-256 6434bc398543c3bf…

MALICIOUS

PDF

133.2 KB Created: 2021-06-26 21:54:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: cc6df603c0dc71abcc846883a17c37e4 SHA-1: 867867563ba51d6cd799e46420bdd3b0b0c5ab35 SHA-256: 6434bc398543c3bf8e1981af9cf8bfd987ce0e6f2930212b13b9bd21a50605e1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The presence of a link farm pointing to multiple compromised WordPress sites and other domains suggests an attempt to obscure the final destination and evade detection. ClamAV detection as Pdf.Phishing.Trojan further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9856

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 http://drivescuolaguida.it/userfiles/files/gotarobijodejugugudikeniz.pdf In PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/16072f1806c3e8---nuxuwumoxufufutovanemo.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210503043036039038j5xln1.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16071dd1de27de---29251320554.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/6521621010.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/t8h1abejgftlj3etia4r59edd3/morutagibagikorowovur.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/336cf1227d61e07c170d20e2f5098417/mifasulikupukef.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/46007868163.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609e72ffb49ee---ramowovakibijitewu.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/zuforefi.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/wowikevobasasexonedima.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/5146ea7d89a798f14f17d28520848bf5/58165788124.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/vapex.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/17306775291.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/zesuxukefiritavu.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/e1e26218c839b52bf508b85e874ff7dd/zupofolejagu.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac469a8bf6d---xobogiwej.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/62520520925.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/zewigamow.pdfIn PDF document text
    • http://lmyc.net/clients/875386/File/nadamaloluluvekeki.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/47pkglpa59mu4jii19v533nko1/vapenezuv.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/45338da980185e07ee2b78c04944e78e/94687612298.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=prayer+of+absolution+in+confessionPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018e70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E70 10684 bytes
SHA-256: 967fabc99816259fb607192a8162b69eb07ddf8344b2e65ad1f1b3fe63d3347d
font_01_sfnt_off0001a715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A715 19668 bytes
SHA-256: b7d18af464f9ceac4b2b089985a5aedb28f58649cfadb355f90a28ad7f584f1e
font_02_sfnt_off0001d967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D967 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001f178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F178 16088 bytes
SHA-256: 5f75525109a44ee407122063e533377bb670263fb67541af9fc6115546547b33

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