Malicious PDF — malware analysis report

Static analysis result for SHA-256 dacd76d71e8e089f…

MALICIOUS

PDF

90.0 KB Created: 2021-08-06 12:16:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 32d5d17853a0de8f1e8d3123fa332583 SHA-1: 39bfaf2946e4f90f5085b8e17055543b8b0594df SHA-256: dacd76d71e8e089ff74cc53df8400068399462bfd4bde03fe6a316d603b507ff
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The heuristics indicate the PDF is part of a link farm hosted on compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://supporttmes.com/clients/2/26/2647aeee05d38019bb2ff7af4ee9f9d5/File/2241635937.pdf In PDF document text
    • http://choinka4x4.org/cms/files/file/3616211408.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xemupajolij.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/385f6e04258181a69a398a44e529d30a/toxopodik.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/sijitadevewame.pdfIn PDF document text
    • http://nova-auto.com/upload/xemegokes.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/cohqd94t2acnheh2pu7ee7bau5/gakinob.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c36c654954---xepiw.pdfIn PDF document text
    • http://zxsolar.com/d/files/nosizejaru.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/piwuberusuragi.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/8b0f3bb58cf4a554c92ae128baef5282/55051397222.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/45379624492.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/29693425988.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/cd2eba876b50048c6a049f32481f1624/24995046269.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/73185539641.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3a38e7eac---netaxavobagipebixosefiwo.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/6e8b88f7c791ee052fae9e3972bec449/dajizijefixafefusalewovu.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/fd25cbb514e607a4e60af009bcb2bc92/dekenujetaseseb.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/55319431868.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/zametexabegixed.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/sukopunaja.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/78640736512.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d0391da3966---tejilaremujopilug.pdfIn PDF document text
    • http://debden.org/userfiles/file/fubepitemaju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=why+do+we+use+a+colorimeterPDF 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_off0000fc6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6E 10824 bytes
SHA-256: 072ae09f58c3f979c6a9933abe5986510f94ff8dcbd0927b95bdf0be378dc3a6
font_01_sfnt_off00011580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11580 16932 bytes
SHA-256: 8dbb916d6b54528ac732ffee109072c8fd3419ffde8fdd701926a7f6f82f0288
font_02_sfnt_off000141c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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