Malicious PDF — malware analysis report

Static analysis result for SHA-256 9607b247b0f48c6e…

MALICIOUS

PDF

80.0 KB Created: 2021-09-15 15:14:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5b42e6e35ab478fd9b126d02808ce994 SHA-1: 53cac7822963ef5d083f048622544e82644bbf79 SHA-256: 9607b247b0f48c6e0a4f6b7107a955f3ae5e4b9141b01bf6d41ebf280cb137b0
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://skupka23.ru/upload/m/fotexudaf.pdf In PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/80921818223.pdfIn PDF document text
    • http://getem.eu/files/file/58714318553.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/wapiwutesetibomanidamon.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613253d791c44---kodurimegimovajukusatita.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/72993179090.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/68935412171.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca21099427---virotujorog.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/88499964210.pdfIn PDF document text
    • http://kabaretyimpresariat.pl/Upload/file/ximavebipiwevuxuxovivati.pdfIn PDF document text
    • https://groupunsur2.com/contents/files/nibilidadesulurafev.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/rexadifafugamid.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/fotuminapex.pdfIn PDF document text
    • http://mayinluatudong.com/uploads/userfiles/file/4853200132.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/dutomufowaxizikaju.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/gijoxezijenigijodugom.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/sonogijoxesunimige.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/74035092168.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/rokamizejejejotav.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/2a3913cef5389755f4d60cf368891723/guvisawufuviza.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/fijujigekuwipalesekaxixe.pdfIn PDF document text
    • https://gosselindesign.com/images/from_fckeditor/fichiers/8596937250.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/zelolani.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=find+nfc+on+my+phonePDF link annotation
    • 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_off0000d571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD571 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED88 10404 bytes
SHA-256: 95ce06cf254459dbb4cd8313e5a10e46f9757cff9cc92ef9fb486037039ff9fb
font_02_sfnt_off000104cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CF 17620 bytes
SHA-256: ebcf7a055b7d8627540a821c56321f0f7d265e53517d6f24e2ca04e1cdf89de8