Malicious PDF — malware analysis report

Static analysis result for SHA-256 a73d74348878876b…

MALICIOUS

PDF

98.5 KB Created: 2021-07-27 18:02:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2e72deb234ebc21a021d287851512876 SHA-1: c736119a72ef98df04b4be9ab3fd3e6dc414d078 SHA-256: a73d74348878876bae6dfbf77e7bccb20c87ef9fcd962c9b381c94144839e2a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the nature of the link farm and the PDF's structure are consistent with techniques used to deliver second-stage payloads or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://rapet.hu/files/votilut.pdf In PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/9713cb39dc88b0d7018eadd1b0fde09a/48397690120.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/41211c4e16dfabc9d8ec796fd4890e5d/nelukekimiruvesanozutura.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089fee694f78---85367060815.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbd6d9dbff---demerixezode.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/927e9abfd2679d1eb16878f58df4c021/vobokuwiseb.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/favivozu.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3117907d34a5ea7baa3a3c92ed0364ea/20258061181.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/92adca0a66759ae100673dea411b3018/vilitomivazex.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe87fb68de8---viduze.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c95b2c77019---duwejiziwanafamelorajomu.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1607b85b643d45---763355003.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/77930123101.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160860193015fe---koforodavowulaxi.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a2665d4ab---1252995160.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/pewijuwesajefukoxubix.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/5k5tgrjv6u02ofkhs0rjsbrv16/vefatogigoliputareworexu.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16076930594605---94028503047.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/222a14f7f5499f36fd47789e1f7ecceb/tebov.pdfIn PDF document text
    • https://clap-bas.com/userfiles/file/99206079498.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/61010108367.pdfIn PDF document text
    • http://keramann.ru/uploads/files/39247801413.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eaaaf8877b---dewesijawopog.pdfIn PDF document text
    • http://weymouthhighschool1960.com/clients/9/96/9679770cb43d952edac6f872f7aef95c/File/jenuviser.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/791906904c34e5f7a6ccb5d71af72eaf/3540270609.pdfIn PDF document text
    • https://signika.pl/Upload/file/54699189077.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/d2b5e70eb45909991bdd3e8a4a3e4f58/44217859594.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=grand+grimoire+pdf+portugu%C3%AAsPDF 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_off00011884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11884 11096 bytes
SHA-256: 2fe4594e10aa91aa8da1380e8717e103588586b33f14b36ff1c6996ebe29dbc2
font_01_sfnt_off000131e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131E6 19628 bytes
SHA-256: 3c550f996f325a27f656a34ceff31ad1633fae80b2bc1501c7436fbc1d15360a
font_02_sfnt_off000161f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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