Malicious PDF — malware analysis report

Static analysis result for SHA-256 1339bd722b3168aa…

MALICIOUS

PDF

74.6 KB Created: 2021-09-19 02:35:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b8b24f4baa8535b22eda09d0f5ba88e4 SHA-1: 74ff1298efcb5442f1460fdc1b6fb9b5b3f8dbc1 SHA-256: 1339bd722b3168aab5432ce3f27e93f0a3a076fa3e5df8ec26ceb8832a4bb418
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Additionally, numerous heuristics indicate the presence of link farms pointing to compromised websites and disposable hosting, suggesting an attempt to lure users to malicious content. ClamAV detection and ML classification further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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 https://cructi.ru/uplcv?utm_term=hidden+cricket+games+for+android PDF link annotation
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/45379492071.pdfIn PDF document text
    • http://ecohouse-lab.de/userfiles/file/ruzepezagibazososoxagad.pdfIn PDF document text
    • http://domainecomps.com/documents/files/mumajolumexinozi.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/61692799234.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/61205545213.pdfIn PDF document text
    • https://geloracinta.com/contents/files/xovomavoloranixuzigap.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613a8b3c54376---36074517780.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/gidurigadezezepagib.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/49718374929.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/nadifamoguxovalalutom.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/lotojoverirepo.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/59530498749.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/novulumasezoxi.pdfIn PDF document text
    • http://ryyw.com/upload/files/2021/09/202109110300572446.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210914121624351.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614119fac157b---vipowazegamogufetu.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/pigukevenelu.pdfIn PDF document text
    • https://invision.buzyhub.com/files/9229353348.pdfIn PDF document text
    • http://agrion.org/upload/fichier/garavufukuradabegatupuv.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/14117177989.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/83266156519.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/betevikoxiwababenokunekad.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/fijejegasip.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/da5b7b7449e5de0dc2703dae3580ba0e/mutadudinumit.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/bogunisa.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140317d3bca2---kolekibomovubej.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/5ojcp4ho088l1e6rs8dfe60lbj/96510357558.pdfIn PDF document text
    • 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_off0000c234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC234 16484 bytes
SHA-256: a8bc92d8054b840148a3766332d087926807e8bb72f3db4eeda941afeea5ca35
font_01_sfnt_off0000ec21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC21 10856 bytes
SHA-256: 74534c0721e173e0d7eebf51ab2624b6008f1b5e466cd5b9e3ff021a82827bab
font_02_sfnt_off000104f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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