Malicious PDF — malware analysis report

Static analysis result for SHA-256 20d9067fe19c3ba8…

MALICIOUS

PDF

78.1 KB Created: 2021-09-19 17:52:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e9c973e7b45d304a236f3f7abaf777a1 SHA-1: 93fee40bbd679be041bd82c1a95dee301786ca85 SHA-256: 20d9067fe19c3ba8a04fd7c27e82b223190e31c310809cd9490f44dbc2c0e80f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://laborke.ru/uplcv?utm_term=duo+video+call+download+for+pc PDF link annotation
    • http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/vatarefexatuvor.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/difuniparidixagumilil.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/nilixojerukokufimefaduxe.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/budaz.pdfIn PDF document text
    • https://aitalk.vn/upload/files/91158828926.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368cbd4ec95---ritomesokidavoteluw.pdfIn PDF document text
    • http://noithatlekhanh.com/Images_upload/files/mexidaxejaki.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/vibugevamazafa.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/59211616930.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/161436e9e4e5c2---gexirekoxegilexepifen.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/xanaragarazixawab.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/85e6ef0be960827f59a4dfff043deb7e/82643564105.pdfIn PDF document text
    • https://duragloss.pl/userfiles/file/83784111637.pdfIn PDF document text
    • https://gospel-streams.com/asset/ckfinder/userfiles/files/79820315507.pdfIn PDF document text
    • http://sensor4you.com/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/4410699922.pdfIn PDF document text
    • https://idosekotthonaveresegyhaz.hu/files/files/dederajafomi.pdfIn PDF document text
    • https://vzglavniki.net/data/file/23492717059.pdfIn PDF document text
    • http://budaors.varosom.hu/userfiles/files/dudisu.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/36906505671.pdfIn PDF document text
    • https://ajambary.com/userfiles/file/bavixefajixujezurugomuvel.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/92221708176.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///napesofuvizume.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/rajikukakisuzaxeladoroxe.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_off0000cc10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC10 18080 bytes
SHA-256: 15f1264fcd82a9b335a969e473267499f98e8fd40799b399a4d0fccc2901624e
font_01_sfnt_off0000fa8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8C 10600 bytes
SHA-256: 47c17318b4ed1b00076bda81dd9214914f29a20af0e58733cbc1be7a67106ea4
font_02_sfnt_off000112e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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