Malicious PDF — malware analysis report

Static analysis result for SHA-256 721d4c94e1fe1465…

MALICIOUS

PDF

76.2 KB Created: 2021-06-27 11:59:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9b0d918a20aa603cb875ec26f5effdf4 SHA-1: e017816281ea4826d0874156cbb98aed81e308fa SHA-256: 721d4c94e1fe1465b98d7b391dcb62286a6432b854868fe860c6079c77db66fb
124 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised WordPress sites, indicating an attempt to distribute malicious content or phish users. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the presence of links.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4683

Heuristics 5

  • 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
  • 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://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078c68628c45---gujirezitidugugog.pdf In PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8533c09759---fipukanugava.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/32836854647.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16099af4bc98ab---73662054277.pdfIn PDF document text
    • http://nhsclassof77.com/clients/c/ca/caa0b9827732345dad94809623212052/File/97562656909.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/71308407568.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/a01f3f04bc9b8119d7a4268e2228d8fb/43428132766.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/bukunaxolo.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/kikavonuzasim.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/59835022683.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/7b0cea7681b62fbf29eb05eac174a9e5/jelisozobewar.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/xoxudiwojuzaxok.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/f6a837648856127877084273c20aac34/puforabivaw.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/1480688358.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/10c1c618a2e5190dc5042055c3da64ef/46700354328.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160856814af7c9---givasunodefubo.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a01302ed26---lesafo.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc8f8b1bb4---67819074520.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e66f41a1c---vegobajatag.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/2o1g0hd0k3k3fdtgemn6totoab/22237046786.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c64bfbbc400---gatenifojo.pdfIn PDF document text
    • http://vitajeans.com/ckfinder/userfiles/files/77772057894.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/991e34ec043d33905824994bda8c5336/14635017312.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/202e746f044e99dfbce96a9782c82be2/33707409949.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=discharge+during+pregnancy+first+trimesterPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CE 11116 bytes
SHA-256: 44b1a016bf0db1f1f6f8ab1c53c89f46e70d3b65e4d66afabb3a4353cb9d59ce
font_01_sfnt_off00010270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10270 17124 bytes
SHA-256: cbb8a625c198599469d1915c43c4d92e70631aed7ea4a11dd2447a358316328c