Malicious PDF — malware analysis report

Static analysis result for SHA-256 56a71ccdef292633…

MALICIOUS

PDF

80.6 KB Created: 2021-09-03 07:16:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8f6dccc92a4f60d890678b4bb54c275c SHA-1: 4594f437bdcc96b91ccb8b748c467f8281e33fe5 SHA-256: 56a71ccdef29263362204dc9d7406d28a6652c95de79f1f98fa67c883d2c35d4
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document's structure as a link farm, coupled with the compromised hosting, points towards an effort to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://philabc.ru/uplcv?utm_term=management+information+system+syllabus+pdf PDF link annotation
    • http://eiak.org/upload/editor/files/romeluzafilabokabemozulum.pdfIn PDF document text
    • http://sushi-belovo.ru/files/lekinaluwomogizojare.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16077ce10c2dcd---mimesobopavufog.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210611_EF6F79BD3FF664CB.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/keditepewaxexujuwoxi.pdfIn PDF document text
    • http://ray-king67reunion.com/clients/41562/File/wepepitifirewul.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8e5d1f41b---fewovijojapulasevimuj.pdfIn PDF document text
    • http://zussobrance.sk/grafika/dokumenty/gosimigo.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608556627d649---94650935847.pdfIn PDF document text
    • http://chinalabware.es/d/files/rititumidebuvovofenilako.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/dipinixezexisoviwibo.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/4cb22239aaeb941456dfee1544db6637/72289028462.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/48890783954.pdfIn PDF document text
    • http://camdohungdung.com/upload/files/vuwigitejukotana.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8214dc9b4---rinikenafuzadekaxono.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/73298010092.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/47933746140.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/63951939988.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/didalewozem.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/tijexozokita.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/59995641081.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/dasajexisi.pdfIn PDF document text
    • https://tempegaring.com/contents/files/dokunojelulojugozu.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_off0000d7da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DA 11188 bytes
SHA-256: f09ba197ffe2e304572e469e0222599c3b40e0439d1d5739d6ec8c720fee256e
font_01_sfnt_off0000f190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF190 16700 bytes
SHA-256: 9eb8e7296a2b132e5c0fab4d9f2d43c142592a646afe9068aeaa1d906353e907
font_02_sfnt_off00011c0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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