Malicious PDF — malware analysis report

Static analysis result for SHA-256 c871f9451d4cf4d4…

MALICIOUS

PDF

93.9 KB Created: 2021-07-23 15:43:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 93d8bad3ec4d8469c6cc5e2f0d0d1a5b SHA-1: db638e48d38626bca64f8828e43b0650ebc95507 SHA-256: c871f9451d4cf4d466ae3de298b0751d2a4d8f8e80e149e98dfc88e35cc8a6c3
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS upload storage. The PDF's structure and numerous external links suggest an attempt to lure users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://pet-fashion.ro/mm/file/61325781704.pdf
    • http://aite-materials.com/upfiles/file/451913379.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c272f32f0f8---12615766313.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ddc8b0e3d9---xitejujimovogusavutike.pdf
    • https://clubesolbra.com/uploads/files/pixojar.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a6bc34639---10330976168.pdf
    • http://onboardviaggi.it/themes/userfiles//files/kupupumesuma.pdf
    • http://malagi.pl/user-files/fck/file/zefufo.pdf
    • http://geometrarontani.it/userfiles/files/demefanodojepi.pdf
    • http://lionsmarsala.it/userfiles/files/piloduvufenijozizaka.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2d2f18a78---mamazigupi.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d94144ee5---tedepelavobojili.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd48d9977e---gojopexunal.pdf
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/63a835d1c1222fe5c8f47d68fd0314e5/94105840836.pdf
    • http://bigdoughpizza.com/uploads/files/mogusamelapixa.pdf
    • https://topinsolventa.ro/userfiles/file/velazomabuduxokawenizizi.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5f59604ea---tabesawutu.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c71fa29c553---82343496342.pdf
    • http://geoplan.su/userfiles/file/75195591839.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf3b036551---gurafodoxa.pdf
    • http://iviltra.lt/images/files/luletafij.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16098a9ded4865---zaluxekiwezewen.pdf
    • http://www.aadhar-interior.com/userfiles/file/patovitexesuxelumote.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+install+sketchup+2020+for+mac+catalina
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eee2.bin
677e9695f62afeefa27de66f2ae2c7cbd721294f5310bfc85fc12255cd4c105a
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE2 16380 bytes
font_01_sfnt_off00010517.bin
de37f2e4b188bc4e410021bd84d0359b555046011d3c165aeb1fd5e5126135b5
pdf-font-stream PDF embedded font (sfnt) at offset 0x10517 11256 bytes
font_02_sfnt_off00011f59.bin
da6aaf15b1512ed0a373a6571fc9bc5c000d2a3571effbf16959cd61b0578266
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F59 18656 bytes
font_03_sfnt_off00015032.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15032 16792 bytes