Malicious PDF — malware analysis report

Static analysis result for SHA-256 68a197fd5f3d7ae5…

MALICIOUS

PDF

80.4 KB Created: 2021-09-17 08:48:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6877d97a812f2d9c526427566a872999 SHA-1: 0d792eca853cae29d5d19469af87b5596e407ff6 SHA-256: 68a197fd5f3d7ae56bab5575f0cef9484b9fa9b7be434ace34862f0c6b3f7d18
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_CLICKFIX' heuristic suggests social engineering tactics designed to trick users into executing commands, likely to download and execute a secondary payload. The embedded URLs point to various domains, some of which are associated with compromised CMS uploads, further supporting the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://derfo.info/resimler/files/94248366698.pdf In PDF document text
    • http://tonghuichem.com/upload/files/71163642002.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612efb4ed71dc---levaxavugudewoj.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/gidonumadod.pdfIn PDF document text
    • http://scsychem.com/upload/files/81955556346.pdfIn PDF document text
    • http://grimastone.ru/files/kosuwawanara.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/gonowibutoxomadit.pdfIn PDF document text
    • https://alternativi.brtim.com/uploads/wysiwyg/files/fazapet.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/danubetoz.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/545d02692ef67ed4d9ee44de2a306620/tokesowo.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/51380690178.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/nijawepubepan.pdfIn PDF document text
    • https://xn--90ah6akb9e.xn--p1ai/f/file/degakuxezibutipu.pdfIn PDF document text
    • https://jurad.eu/files/file/dokumofusazatovu.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16142eec352e44---tuvadojesijavo.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/50003407995.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/bufiwiwutino.pdfIn PDF document text
    • http://mertcelikkapi.com/userfiles/file/gegujobuxasufewe.pdfIn PDF document text
    • http://1-sanya.com/blog_images/blog_/file/kejabavobuwogad.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16132d13817946---2589451319.pdfIn PDF document text
    • https://ntc-container.com/upload/files/66669754629.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/47436962094.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/bokubazewoximirapuloras.pdfIn PDF document text
    • http://joltiy.ru/uploads/files/31326294948.pdfIn PDF document text
    • https://learnrkbin.jugalbandiresearch.com/ckfinder/userfiles/files/53940055011.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=best+lock+screen+patternPDF 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_off0000d52e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED45 10420 bytes
SHA-256: 09307b471ff04b3e1426cde5c9cc8fe815d091ef2db61c8ddb3f92c25db3a536
font_02_sfnt_off00010517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10517 18292 bytes
SHA-256: 08965c748f3baa51ce69620c14f1c3217d792138f0275c72a94011b2e2f919f7

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