Malicious PDF — malware analysis report

Static analysis result for SHA-256 90dd3efca14ab2f1…

MALICIOUS

PDF

82.0 KB Created: 2021-09-02 04:47:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0fda2c1f2cf4a920329b93d2697d22c9 SHA-1: 6d28c0905138cee523a42ecb222b7a3a970a5e6d SHA-256: 90dd3efca14ab2f1df55debec7270942f8862182102d392da3dabc41505e6965
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links pointing to various domains, many of which appear to be compromised WordPress upload directories or disposable hosting. This suggests the document is designed as a link farm to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://ketchas.ru/uplcv?utm_term=ib+command+terms+history PDF link annotation
    • https://kurishupally.org/userfiles/file/xilodiduvafusi.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084d8a94cef3---81497766489.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/3716449501.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/331018400.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c0a724a52e---84092143185.pdfIn PDF document text
    • http://biomisszio.hu/tmp/92415792391.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4263989497---nizaxazilikof.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/76135667343.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0d372ef8b---poguwivetigodabitopi.pdfIn PDF document text
    • http://asustainable.com/global/file/sunudodamikerodumebif.pdfIn PDF document text
    • http://childhood-matters.com/clients/49507/File/bamezekasujew.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/bijipozirabaratosubi.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff702c1b2ab---tofiluronimiwetozuno.pdfIn PDF document text
    • https://ratsimae.eemedia/contents/file/nulenebuzobopirawodaj.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/3dohmef4agu5mc4t5atmu1a9ni/pogenanajufomajowavuge.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/nutasulojeraruvebeno.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/90415332731.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/rixapepevuwesiwetebuv.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/95208a73387e91f5c2d02d48ba4ffe33/beridiwipak.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/b70796f5fb13fbb8c0fac1b5aa56cbc5/83142449471.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210724223738_87zcjb.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/98740812589.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_off0000dcec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEC 10792 bytes
SHA-256: d866ed559e8a406e597846f42dbb7421e1a98b4bc6bcbf871dce377efb397a38
font_01_sfnt_off0000f59d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59D 17216 bytes
SHA-256: 154f37ad2f5b4e00bf9651a76704cd262b054b3c785997b2f307758e661621a7
font_02_sfnt_off0001223b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1223B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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