Malicious PDF — malware analysis report

Static analysis result for SHA-256 e73c3f4248c16bba…

MALICIOUS

PDF

88.0 KB Created: 2021-07-25 14:28:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 42410bfe69d4a7988289ec7beff4bec5 SHA-1: 0aa364a1bafe037f695f1c96d6fec0a1f727801e SHA-256: e73c3f4248c16bba55693c567e8b0dc2159fade3dd32ac04550596ff4679077f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it's a link farm pointing to compromised WordPress sites. The embedded URLs, while some are marked benign, others lead to PDFs hosted on these compromised sites, suggesting a phishing or scam attempt. No scripts were extracted, but the overall structure and URL targets point towards a malicious document designed to redirect users to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/0319beee617b0b9a0ba18a9f5f769a8c/76761227953.pdf In PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608f441330082---besiv.pdfIn PDF document text
    • http://arlingtonhigh1960.com/clients/881088/File/49081746950.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/7ccd04235007c74d76aa39e11d23c005/bubinedetud.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecb1d9a747---zusumafilit.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160b1b0af4c69c---wupipukow.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095d1da2418b---5465474262.pdfIn PDF document text
    • https://tavio.ru/files/file/womuzunaketexuxikupa.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/vexidojofidovajofanaz.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc5a57a22b---delufituf.pdfIn PDF document text
    • http://greenberetrotcmedals.org/clients/e/ee/eef2f5edcbf7b69ea683240098563b39/File/jakuwirirekoxokibodaweb.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e1968d5e4---saweliwafivudi.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/ce5a1ec2914e32e7aa0e1e459e0999b3/69049577725.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/61496734821.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/puzaredawux.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/1673488392.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/79158090537.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210716_70ADD9A1FF831BD7.pdfIn PDF document text
    • http://nontaromclinic.com/ckfinder/userfiles/files/zafigir.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160762f1812b95---pikise.pdfIn PDF document text
    • http://stasta.com/userfiles/file/59684952320.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=centro+de+distribuci%C3%B3n+oper.+metropolitano+d.+f.aPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA1 11256 bytes
SHA-256: c01aa3410b53a2c949dbb1498626e5eb87ecb5bb99def91578f4140da85fd10c
font_01_sfnt_off00010991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10991 17680 bytes
SHA-256: ffd2c575b4f24d9fe56d4dfabc86ab61fcb745fed25058df9ff66483b6d9a814
font_02_sfnt_off00013649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13649 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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