Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e7bb0d1082588f2…

MALICIOUS

PDF

85.5 KB Created: 2021-09-01 07:00:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8207b43d4ea4d1742256eaca4a8d9ed2 SHA-1: 3f320daefcd3476cdf967872f575ba452717a250 SHA-256: 7e7bb0d1082588f2ec284dadef08a240794f3acb31ed5ec0740bbf094179acc0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress sites and other disposable hosting domains. The embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nomylo.ru/uplcv?utm_term=to+be+dogged PDF link annotation
    • http://carefirstyoungatheartgala.com/clients/b/bc/bc61c41cf33a111e4089ebab1e34a2ce/File/gebovolefebobuf.pdfIn PDF document text
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/ritepefo.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5e853a830---nupatarigolozekekar.pdfIn PDF document text
    • http://navrattan.co/userfiles/file/nepari.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df0924e0c7---mifozavit.pdfIn PDF document text
    • https://nitdgp.ac.in/uploads/userfiles/files/65882234296.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/74187839970.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/29638949379.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/68277563207.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/eecbdr8kinep55kg1tilnqf3f5/lidunetesujefuw.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/69592897336.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160948170142ee---58922551865.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/dutosutilabepu.pdfIn PDF document text
    • https://flexi-cms.com/uploads/file/19445424584.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/dukizovepexa.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/41405630862.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/98798983814.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b47f46ea07d---ruxiturumiwiwifumijak.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/jogog.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607889cce225a---27228750259.pdfIn PDF document text
    • http://zzquansu.cn/d/files/70991340643.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/e7890dfc9acfbdb909abae0e1bcf088a/20663066392.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/kefetodotasitokavuki.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16124c848d7ffa---sawubitapojufofasuzil.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_off0000ef41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF41 17188 bytes
SHA-256: ea43ccd4a0ebce66834a5966f6d2b33902379fb65341ae1c247bdb435d84a606
font_01_sfnt_off00011b53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B53 9756 bytes
SHA-256: 6abd66d20e6e3f1a6eea76a59cbcb6363993e0258d5156e53b09e1d714533e29
font_02_sfnt_off00013076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13076 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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