Malicious PDF — malware analysis report

Static analysis result for SHA-256 1defa13bbddc25fe…

MALICIOUS

PDF

80.7 KB Created: 2021-06-29 01:04:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 71dc70fe87ab57a76f6862ea2399226f SHA-1: bedf85ac7a86390ecbdeb869cd546215bde430af SHA-256: 1defa13bbddc25fed818a4c52b56182f580fa5190a15c3e0538b4820b6240bc1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories and other disposable hosting sites. The primary purpose appears to be directing users to malicious content hosted on these compromised or untrustworthy domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a57957437bc---60438194607.pdf
    • https://zoorichi.com/temp/fckeditor/file/fawirutoguvasipo.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609443c3e5e23---96762475761.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/b679528de2a39608e9d5b75769ea62b4/vefodi.pdf
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16088ffedf2a37---77421800227.pdf
    • http://sjar-tech.com/uploadfile/file///2021062110254424.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd46fa6f33---mikixewixeraperesumom.pdf
    • http://tsradviseurs.nl/mailing/images/photo/file/wofimizojekisiroxejanes.pdf
    • http://vamaconsulting.sk/userfiles/file/nifiz.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/aqojm7n6jqbhpdqug9qbimmbb7/94306907677.pdf
    • http://nextgt.eu/uploads/file/69403309493.pdf
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/c0cf15d2fa85d1e510eed63f9583d960/51479814361.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed36e7b65b---73498535039.pdf
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/22660d88af3fa0160e4e343eb2ebd574/79830201161.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9863c2a39c---81362422139.pdf
    • http://hopkinshigh62.com/clients/7/77/7764523e397120ad9b09b1da26998858/File/74527790608.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/e073a92fba6fa7d0f98192e1ac16f214/65902864201.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607418ff6724e---96812752648.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/prpdegqgk0fga4k4bmued2l9tp/sebesawalix.pdf
    • http://vitalenzyme.com/uploads/fckupload/file/mefatuzizuselawisonos.pdf
    • https://cuisinescartier.ca/upload/editor/file/voxevuwali.pdf
    • http://hainescentreasia.com/images/file/puxonukokefem.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ae28c548cf4---ximazod.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160be61af676da---nibuzifisidiluxelik.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=the+view+sunbury+on+thames
    • 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_off0000d4ef.bin
0e1c70aa01a29159e2ec0727b6711b93b39128cbad64e277715e2930554e05f5
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4EF 10796 bytes
font_01_sfnt_off0000edc3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC3 16792 bytes
font_02_sfnt_off000105d5.bin
4478cb88b654c63d559462e7e7e691b9a141fbb312fc63a2eb1e911520a9034a
pdf-font-stream PDF embedded font (sfnt) at offset 0x105D5 18124 bytes