Malicious PDF — malware analysis report

Static analysis result for SHA-256 435dcb65b36c63fb…

MALICIOUS

PDF

85.2 KB Created: 2021-07-18 00:33:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: abcd48a04fd0d216b305d968caaa58a2 SHA-1: 46311f4537707a9171a8e892f055a6c9b5bb4019 SHA-256: 435dcb65b36c63fb4bd9f709fa50bdc17b4b64691a443f3547ba2813716cd6d8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to direct users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/kasodogivijikawozitivixab.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/afc49e393e8fd01e63caee4b23d871c2/simavagidikuvovudogam.pdf
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/ceca8e6a0f3c4c4b7b0fa7095cf45fec/nuligulixula.pdf
    • http://cukiernia-waltar.pl/qcms/userfiles/file/82296523478.pdf
    • http://isgsrl.it/images/file/votafazaw.pdf
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/67771366934.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/844e78adcaa2f993b281c7fbdba3fa5b/86558664368.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/i0pnnkun1kh0r2rthhoffrea7m/5929239836.pdf
    • http://sun-green.nl/ckfinder/userfiles/files/9093801063.pdf
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/9cc9512b430273a07231660f79ce3dc0/77057865823.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2d481fba6---29152158157.pdf
    • https://reitinguok.lt/userfiles/file/lolimidefigonup.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/fufvirrsrntl40jio1rg8jqjk5/tefutibovuze.pdf
    • https://transport-vehicules.fr/userfiles/file/radow.pdf
    • http://aedelsur.com/contenido/files/dutifexiv.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86310375a9---3155926761.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160f050380a9f3---31900100570.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f25b9a93d---78870727991.pdf
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/jqpls9mrjp9o1109j61aqv0s6a/14667436587.pdf
    • http://bhsclassof70.com/clients/a/ac/acf0241a72c9eb28a719a759cf8a4748/File/99376671134.pdf
    • http://fredericjean.net/oplusco/file/zogujewaba.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b8b28b808---rumiboxukivebabakij.pdf
    • http://sharon-barron.com/userfiles/files/fedoletajolijikoxobaj.pdf
    • http://dgjinhak.kr/DATA/upload/files/202105290850578883.pdf
    • http://alnadaoil.com/userfiles/file/rimazo.pdf
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105050206266165.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=digital+marketing+analyst+cover+letter
    • 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_off0000ea9a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9A 16792 bytes
font_01_sfnt_off000102b1.bin
3cea1a82a19a8c3dc0e81009bed43a31a8bdaf243a83b73060ade15921e63fbe
pdf-font-stream PDF embedded font (sfnt) at offset 0x102B1 10848 bytes
font_02_sfnt_off00011bc0.bin
cd5616d1e5febedabb4da8ef991a65730b866687ffde6e33beb622e5cf6f5f25
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC0 16832 bytes