Malicious PDF — malware analysis report

Static analysis result for SHA-256 56d9d3f1e725599c…

MALICIOUS

PDF

86.9 KB Created: 2021-08-08 07:31:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: d1d37225f5e9a61d3f00496c51db5f5f SHA-1: 2ea4de3d149bc74e4ca079bfe9ee6b59ba2b57d7 SHA-256: 56d9d3f1e725599cf0523bdb6fa6ec92a8158876a207478dd9236f591e7324c2
96 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malware. One prominent URL, 'https://allytemp.ru/uplcv?utm_term=google+play+store+download+for+iphone', indicates a lure for users seeking to download applications. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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://allytemp.ru/uplcv?utm_term=google+play+store+download+for+iphone PDF link annotation
    • https://k-newsletter.com/ckupload/files/76537241156.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/gutovu.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/48138800231.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/rekov.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/17248985954.pdfIn PDF document text
    • https://advik.net/userfiles/file/87695597322.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/81876438510.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/detifofabuberiw.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160e7b33e845bb---jotuvubopusudirunipul.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606dcace70f56---94422604971.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/xoxetidaxumenaxekuwis.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/96199085204.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/cc51f3c7adf4f0ca2fbb22e1603f0d85/derudesu.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c14a25ef9d1---minuwo.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/f1dc46e16945fc81b37b160ee252d851/44110446135.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfffcea0482---milapakutilepafij.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b70c435ff69---kupezonuvoxaxedevi.pdfIn PDF document text
    • http://bigpictureresources.com/userfilesbigpicture/file/kewivugagukajux.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a648988dbe8---86706452918.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/53971464847.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/27601251237.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/vuxugoxelinobefudige.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/a7c41a944f5d4d842a47a5727c9a99fa/nutapeb.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://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_off0000f2ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EE 16620 bytes
SHA-256: e98eb06b0dc4a01466303173aa11f2d8221b36110e00e8f7e80ac610db49b5d9
font_01_sfnt_off00011e47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001365e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1365E 11016 bytes
SHA-256: e39b7baa181c9ccb75e9f0194ca7c099c84d1f8db6321a73225301f3bc3bf113