Malicious PDF — malware analysis report

Static analysis result for SHA-256 17fa7fbd30bdd530…

MALICIOUS

PDF

80.3 KB Created: 2021-09-19 11:19:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 236b3c55bc16a28a4199db841a1074f7 SHA-1: 196fa82bc0ab3043bb2bf6c3dfd98e4d38034f9c SHA-256: 17fa7fbd30bdd5309854997a0f8de1b45c8ca39898556677b6c818d75faa1e55
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of credential phishing and browser extension lures. The embedded URLs and link farm heuristics suggest an attempt to redirect the user to malicious sites, likely to facilitate the download of a payload or harvest credentials. Although no scripts were explicitly extracted, the PDF structure and heuristics strongly indicate a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://smidgel.ru/uplcv?utm_term=can+you+sync+contacts+from+android+to+iphone PDF link annotation
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/q8pdatfre4ut55tehboc0lqng7/84803663808.pdfIn PDF document text
    • http://kkc1.org/htdocs/cljr/data/files/74702124460.pdfIn PDF document text
    • https://derfo.info/resimler/files/jukesovedu.pdfIn PDF document text
    • https://pnvvr.ro/userfiles/file/luwarozel.pdfIn PDF document text
    • http://tuecpa.com/file_media/file_image/file/rakuxevuzidenevudu.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/91935337402.pdfIn PDF document text
    • http://nordicwalkingturak.hu/_user/file/vepakozokasapije.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/161439ef7a3dce---72323842841.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/xegojuvovevil.pdfIn PDF document text
    • http://itaxabc.com/userfiles/file/20210901232120_859867231.pdfIn PDF document text
    • http://iphysiology.ru/upload/mulukutawose.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/42147077974.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/82281726014.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210917/210917204316094438lh8nyot91osg.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/zetilikejijafemiluto.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/xofanutebelavuxuxugokogim.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16139b8368eb2e---65288313593.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/55498955577.pdfIn PDF document text
    • http://rfinshaat.az/userfiles/file/93284265818.pdfIn PDF document text
    • https://flomogroup.com/upload/files/nexepiv.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_off0000d68f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA6 11084 bytes
SHA-256: 4252f1258d5a6d3b7d2929278a3f2b5d30d30e4bdcbbde283700b8d49640df9e
font_02_sfnt_off00010864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10864 16804 bytes
SHA-256: 31b4243c1cc89dd8e15e47aa38c7d27d158dd6495d6d52529d28051a524ad48c

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