Malicious PDF — malware analysis report

Static analysis result for SHA-256 290c9f94e5dee8a7…

MALICIOUS

PDF

86.8 KB Created: 2021-06-29 02:18:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2c6400fefff6a69ed24d0cf83763747d SHA-1: 4503b740b5380210ea798b5783269b27dfb7679e SHA-256: 290c9f94e5dee8a7f6c95ce36d43318ce4f6dd82afe57400fc745fd1616a9ec5
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting a phishing or malware distribution lure. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16097232e7a8f2---kilenumumeber.pdf
    • https://ceral.pl/ceral/pliki/file/vukovujosu.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/2030e09912aabbca039b20ce1eae4835/taxorenaw.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/ikg4hdd2oj079n6omkonqf4ju1/foxesolar.pdf
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/mkting030hnjgva4aapd4j5tc3/zokezataral.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/a422788119028c3c650f0a285d9cbf82/10541706668.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607617d6557eb---tisizinamasuvinetiter.pdf
    • http://tw-go.org/files/dujeropopoba.pdf
    • http://tpokebar.com/uploads/files/jojasikagipuwigo.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16077e747c47c2---87228044272.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160906ffa17331---16388729197.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/a257665c3a13647d711543df81a65a60/18408652287.pdf
    • http://51-lq.com/userfiles/file///xerifofaxavuso.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d3eb83e9a---zoror.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb340477323---21829493212.pdf
    • http://shuswapladystriders.ca/userfiles/file/vasoxomikasabarelabujavi.pdf
    • http://come2menorca.com/images/file/zevabe.pdf
    • https://landi-bg.com/images/file/zolomoxirux.pdf
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sidexaremifojimozizokeg.pdf
    • http://abpaluso.com/upload/file/54265613608.pdf
    • http://nakamurasangyou.jp/app/webroot/uploads/files/15038804880.pdf
    • https://pasarantogel.com/contents//files/46646269625.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/j6uqpiuhs5a2stbfl1g9o24cio/wimixulomataxubinatelu.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a2a5d16c0---74909448296.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=pink+yellow+and+blue
    • 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_off0000ed6d.bin
2689a10bf27e29727e2adc21bf258d67f7e38d01da2436c1834d42d4af49e199
pdf-font-stream PDF embedded font (sfnt) at offset 0xED6D 19508 bytes
font_01_sfnt_off00011f4a.bin
9c333e336c30745540b899afe7128f8ecfb82dccd2464df6a9e96d0338c58af3
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4A 10408 bytes
font_02_sfnt_off000136f3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x136F3 16792 bytes