Malicious PDF — malware analysis report

Static analysis result for SHA-256 e89bc8cdeddf3bff…

MALICIOUS

PDF

83.5 KB Created: 2021-07-10 01:47:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d428000910a6ea1c9e51fc7f0f36f931 SHA-1: 9edccaca57702b899b35508a602d01fd1e223442 SHA-256: e89bc8cdeddf3bff8da18c2bde0b005447eb528557b4e1195ae51eec660f9e8e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites. These links likely serve as a distribution mechanism for further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

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://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0ce1bda29---mixuzuwoxazutadifafaj.pdf
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/u7pg6bp2bkl55778kq3n74c5u2/24734853240.pdf
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/ed46b3e3fc43b3ab6e3acc048aedbd6f/63499228467.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/5iti2i3of9ilb0pq2v0c847047/77823323833.pdf
    • http://edelstar-mos.ru/files/newugagelevopiwoturutek.pdf
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084256120b7f---jababamaxodobofu.pdf
    • http://absolutelyneon.com/userfiles/file/93455294170.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bbf6d8366---92720641922.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd98414ed1a---69897943696.pdf
    • http://gorisum.net/fckeditor/upload_file/file/269303932.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a29d6412288---59281328592.pdf
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/ab9c651de94bfb7d12c3eaf2673d82dd/65606808637.pdf
    • http://eko-inwest.eu/upload/file/virovo.pdf
    • http://americusfelderfamily.com/clients/0/0c/0c5e5e27a4da9db51eb23c24aa0fa274/File/zodujiposovivajaziripuk.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e23ca4e983---24875773141.pdf
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e39052690---28350022149.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608cddb4a308e---6132569105.pdf
    • http://nanobubblevietnam.com/uploads/userfiles/file/junajelijawevu.pdf
    • http://hoggard1975.com/clients/a/a4/a43fc1111b7ad4318f8b553feb79a890/File/rosoji.pdf
    • http://gtlmarinefuel.com/userfiles/file/kogilolamivesevixaj.pdf
    • http://gasthaus-steinkirchen.de/img/editor/file/munekaxagojunepot.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/03f359e9e6b6c6a08fca675c23884099/13724375780.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160962a96bc810---kovujop.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=525mm+to+cm
    • 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_off0000cadb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCADB 16792 bytes
font_01_sfnt_off0000e2ec.bin
ca256ba081f52bf65081d57fe7a36c0fbee2a6744b8a8e665813c50580f02b9b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EC 16464 bytes
font_02_sfnt_off0000f9b7.bin
95534be10a02cc9c1ee0e066dfd357b0595832c8e4c5739c061d88af8d5f2aae
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B7 20512 bytes
font_03_sfnt_off00012b7e.bin
4a2def12c8207ae4aff256c0d2b2658fd388bafb939bb146d8caa1bace3d9653
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B7E 9744 bytes