Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ed421218b13a79c…

MALICIOUS

PDF

77.4 KB Created: 2021-08-31 11:14:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3212124075d7e8be3e79ae790bd6023d SHA-1: 8f668dc081f7f85d5459d5d58240c25b9c62a464 SHA-256: 2ed421218b13a79cbcfc55990945f0bbe4447a801d57393a71f06bdc9a2cdcb3
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://medvor.ru/uplcv?utm_term=ps4+store+apk PDF link annotation
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/9caed7b0ca2c8ae144a97e38e839c4c3/95577453997.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/sugikusetoma.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/89991098039.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c1eaf337ea5---vojadaraxomuzuxegavu.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/zelamulalofopubi.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0103592001621912032.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/hur7qjtb3emp48nu7hn6idbmuo/nenazomudenelepekeso.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/1f6c3a423a67244ff323663f45275daa/nodup.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160a530490bac9---wisix.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/i0pmvocan949monqbrqemc2fcp/gepatonabovube.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/66938833586.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cdd28765f2d---luziwujunapafakabezoz.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/punomesolefolazevimekile.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/vonojo.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/jilofakesufovudura.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/250af622fbee8add2b24a7e5eb0c8dbe/98766659571.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/wizulixegilosaz.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5c0fe5a3e---23761608333.pdfIn PDF document text
    • http://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/78776559085.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/lvnn04k9pndo3lsb9ekv2i1dj3/60517970704.pdfIn PDF document text
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608173a109cba---gosenobigedamonavi.pdfIn PDF document text
    • http://secretinvitation.net/images/files/54769691510.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/vufoliwibalujusuvo.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/vusojapawerogofaxadukube.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_off0000caf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF6 18020 bytes
SHA-256: 94a20aa962c39d2f3ce2fb0b4715a19ba82b051ab6cd7a2db6e30bc4385d8860
font_01_sfnt_off0000f96c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96C 10176 bytes
SHA-256: a969c5cb45ec4364a1f367418aef4ecfde24e2579b4c85fabb4c66602a64da16
font_02_sfnt_off00011077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11077 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1