Malicious PDF — malware analysis report

Static analysis result for SHA-256 97f34cb8f9e92d38…

MALICIOUS

PDF

88.1 KB Created: 2021-06-27 05:57:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8ee233f747229e43330c7b5fc7a4e989 SHA-1: 0ee013abd67c08fc761abc096ad3a8d935f4d862 SHA-256: 97f34cb8f9e92d3886d35e11e5226e2582b2274f4dbb0a55d0a9b90f20047e2b
96 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various websites, many of which are hosted on compromised CMS platforms. The ML classifier strongly indicated maliciousness, and the link farm structure suggests an attempt to distribute malicious content or phish users. No scripts were extracted, but the primary attack vector appears to be directing users to external, potentially malicious, URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://pallenberg-busreisen.de/uploads/files/98622502091.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/868ce3ac98e52dab190ebf90249ed755/faxokikaronezajuribib.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a095b678be0---71935358118.pdf
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/5d731a8911c7c00216f8dfb68e34b328/38696272471.pdf
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606f252798542---nuxepasinovofas.pdf
    • http://ildungrice.com/fileupload/fckeditor/file/xadoxabidakalapejiwofumo.pdf
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/cc2c4d30b31ab8a82639497107ec4b57/vebuxovojesil.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a18c7a55d36---48558452740.pdf
    • https://kovtec.pl/eurostyl/photos/file/bazajalazodib.pdf
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/cb00d5edd98e2de6f55a1f858b6bdb4e/fedoxivopi.pdf
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/1c5844b1bdc5a49890572be26f7a8efc/joberozofolulifex.pdf
    • http://amadpich.com/userfiles/file/kaluvivagevesavafotituw.pdf
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/7a394f92e2760cfd5122e1149ec53805/76096372916.pdf
    • https://etonbio.com/newsLetters/images/file/69958639343.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ffjsnanegttpg7hpomfiqs74l5/judasokixovododurokegu.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/da50nf0clk0h2cq35i3hskbihe/gorigaxuwudovagidivonuda.pdf
    • http://eau-msu.ru/ckfinder/userfiles/files/35537551489.pdf
    • https://manuscripthandler.com/userfiles/file/dawavowazujiwawatafire.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/0iibamcpluni17hkju6hcsdsts/fopetumeji.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6b7ce2f9e---73036053217.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/26cc1944221ebac1d658bf282620e1c5/bapelov.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e53b73c2b---50546169146.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd4660c170---68614719718.pdf
    • http://absolutelyneon.com/userfiles/file/dutaratepalijetebodino.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=basilica+of+our+lady+of+lichen
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efde.bin
2341b4d40943e0f78d291f182e0963b157d609ca32166987346bcaf1fca635ba
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDE 19108 bytes
font_01_sfnt_off000120f0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x120F0 16792 bytes
font_02_sfnt_off00013907.bin
bcf6660621f5af5365710d470b2f2ca377abef9c05c96fa0f91c5709359fef66
pdf-font-stream PDF embedded font (sfnt) at offset 0x13907 10740 bytes