Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7b1778c39a42e8a…

MALICIOUS

PDF

92.4 KB Created: 2021-08-13 16:01:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f0d528070bbc285b7966c21734cadcb2 SHA-1: 7fbea906adbbe85d752092a4fab5dfa566352671 SHA-256: c7b1778c39a42e8af25f779fce425813ced1f51d748df2671b1b4c6369be23f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded JavaScript, though not directly analyzed for specific actions, is commonly used in such attacks to redirect users or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/92mga8rojfksbo330i5vb747j0/najagumewefelorofode.pdf In PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160964fbae0eee---15260937560.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/89921452481.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/noviwebafusa.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/vopaxama.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/25611047519.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/13650948.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16082fdb2ed685---95124925769.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/0e35ef1234d34861eea6fa92528c4570/mibuwetepofe.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/35383127734.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mudosobin.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160807a22d8008---lexitujugu.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/14533705284.pdfIn PDF document text
    • http://ballstonfamilymedicine.com/clients/861402/File/kelad.pdfIn PDF document text
    • http://beulahcooleycollection.com/clients/870349/File/70268023982.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b36cafe522d---mubuzuseko.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/jusenojasejemigere.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/kuzenofuxukomurikesosu.pdfIn PDF document text
    • http://ibb-online.ru/f/file/larizolexalogarusupadazaw.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/oj7qpr3o7t00kep24k9v4bk7q8/15818368200.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/5j7le56t3fbok42lo161bvf20d/31246634928.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/0acb2f6e402aa6b156655df0e72787bb/65315453069.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/musikinisekepuxok.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/a6f96af2016b0eddd92106c46314915c/zakiki.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160a879d1152de---59440282566.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/49491318316.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=crear+cuenta+netflix+gratis+por+un+mesPDF 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_off00010009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10009 11056 bytes
SHA-256: 50be2b26bd2922e5319cee873a913ab9edd6f9742edb2f0b6842771ddf15479d
font_01_sfnt_off000119ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119CE 18548 bytes
SHA-256: fae822e38ed354a7ce4f74d70e6637e92afe432efc20a7c4e23ff2ce6330fa35
font_02_sfnt_off000149cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1