Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e9e5fce745102a0…

MALICIOUS

PDF

82.4 KB Created: 2021-09-20 01:56:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 9fd408165438615f6920829e12e08445 SHA-1: 70c6623665dc60ff1e401abb3327a97995fc2173 SHA-256: 0e9e5fce745102a0a95f3e4919e8859e787cc36439c2d4b0b0240e300afd4f52
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

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://pistant.ru/uplcv?utm_term=how+to+remove+an+app+from+a+firestick PDF link annotation
    • https://plasy.com/uploads/file/49027796663.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/xunelofirudamok.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/ddc18faf7c0cf83d855ae616cf25e520/vixonuvibom.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/fagikopigu.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/27106811893.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/lepilojebixa.pdfIn PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lasonafari.pdfIn PDF document text
    • https://termoformat.md/img/files/lepizatixapafa.pdfIn PDF document text
    • http://milkyway-vn.com/upload/files/bixaxakotubesu.pdfIn PDF document text
    • http://xn--z92bzy85x.com/userData/board/file/tisagaputa.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/zamatavamawobuduwug.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/76316176828.pdfIn PDF document text
    • http://onecre.com/images/content/files/69311498507.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0b45db1f7---20348219851.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/jebofekodove.pdfIn PDF document text
    • https://nocrime.cntwn.org/ckfinder/userfiles/files/47995870188.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161464bb719628---zulerofibigimube.pdfIn PDF document text
    • http://ifap.it/images/file/30635640638.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/53345669920.pdfIn PDF document text
    • https://hilanguage-com-tw.triangle-design.com/files/2932890799.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/wezipotof.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef3f334fbb---26088918587.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/02f7a5dac2bd2dd31cfa65161059a3a2/nebub.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/99083562531.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/mizusevam.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_off0000db56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB56 10832 bytes
SHA-256: ad05cb80c914dec1df3a46a5bd00030a4a9b8e82fe018fe1fdef7f8d4d56801f
font_01_sfnt_off0000f45a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45A 18468 bytes
SHA-256: 2bcd34490d390e974802f059cd2cc56487c64ddd2e2e1166dde4b21327d7c3da
font_02_sfnt_off000123a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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