Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c12a7e0692e85eb…

MALICIOUS

PDF

85.9 KB Created: 2021-07-03 02:08:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b47026c6c7ee799093bfdd3d41c15328 SHA-1: f0b5315d829d807dc4a9c9ddbec3a6c2cbf9ef68 SHA-256: 7c12a7e0692e85ebdc7fa7e9ab83200ad7160e8ecdcd150dc8fabbf8a8a313ca
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress sites. These sites host further PDF files, suggesting a multi-stage distribution or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160df9c457ded1---2720285780.pdf
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/4aaa8af288f3711188d65e218331dfda/verexoviduxirutagib.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/qrqa9msue2scjie5r35ab25rb2/linotefetozeze.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc1998bc9d---42930026017.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3058aad4883a6e33bab0d9a219d86580/sozuvulobezasojewatepir.pdf
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/0o14c5s8avei4dv8095ppqak9j/beboxebupubasopazemigakog.pdf
    • http://utuin.net/files/fckeditor/file/soverojevaloxotiv.pdf
    • http://fecoil.com/userfiles/file/nativite.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606e711635058---13497014536.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/972fe85a8d66fa22569c63efe3d389de/22120487056.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf104a6d65---91296242882.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f68ccbfc53---tatibumaxipez.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b0c5736fa---30595519455.pdf
    • http://hurtmar.pl/Upload/file/74147908210.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a32643ce3b9---lozapovidiliwatum.pdf
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/86979533611.pdf
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/eb3d6dcba06603c754b9e5a88696c3bd/5496431178.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/7b1df009bc80b64b5c2a6ca1beba983a/49485866195.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/0jev1dotcplv55smj774o8997n/92390281383.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1564be415---52104715888.pdf
    • http://imaginove.eu/data/Files/soxidamekufoniruzowubi.pdf
    • http://airelimpio.mx/img/editor/file/48924360344.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+to+straighten+a+leaning+fruit+tree
    • 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_off0000ef4f.bin
f4feac7857e6f53e17d9f84098a9cfa47509ee0379564b24af8185e6ff6ffe3f
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4F 16468 bytes
font_01_sfnt_off00011a02.bin
05bbada3139a799bbda63391208c2c568f55fda6873ceb928cac64c9efb4ed5e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A02 10668 bytes
font_02_sfnt_off0001326f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1326F 16792 bytes