Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1736e6276a24f82…

MALICIOUS

PDF

66.8 KB Created: 2021-09-17 21:47:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8872f3f268fbff1e11b02b3c8ef3f635 SHA-1: 4bd1992c75c3c82f0d5ef9f9b6d8cceb3f429b7d SHA-256: e1736e6276a24f8290115004ef9c02727b95bc3dd346f6d8ecc4456ff80198ab
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a phishing lure. It contains numerous embedded URLs pointing to potentially compromised CMS upload directories and disposable hosting, suggesting an attempt to distribute malicious content or redirect users to phishing sites. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure and URL patterns indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 66 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://inwebjor.ru/uplcv?utm_term=dragon+ball+z+episode+135 PDF link annotation
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134fa4629284---4635845092.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/gixalijidoba.pdfIn PDF document text
    • http://elma1.ru/!upload/files/genamarigapowit.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/losaturaguxe.pdfIn PDF document text
    • http://www.s4b.nl/upload/files/27703028033.pdfIn PDF document text
    • http://yjeverspeed.com/userfiles/file/76739923671.pdfIn PDF document text
    • https://kasihpaham.com/contents/files/suwinu.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/65446866113.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16142877639b1f---sawig.pdfIn PDF document text
    • http://flomojapan.com/upload/files/31578402406.pdfIn PDF document text
    • https://tepatsasaran.com/contents/files/pajigu.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021091521541332.pdfIn PDF document text
    • http://montpellier-businessplan.eu/mbp/upload/images/images/upload/ckfinder/2335762949.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/69773409579.pdfIn PDF document text
    • http://getsolarny.com/userfiles/file/87139983462.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/sekozebataxonikageg.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/oeg3otskuvnnbg36q9f5uufrpi/94343971777.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/09/07/file/20210907_191733_186.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/vevidowadupuvonifux.pdfIn PDF document text
    • http://brlairport.com/images/file/zibawojudenekaporos.pdfIn PDF document text
    • https://vinasimex.com/uploads/file/dozobibaxug.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_off0000ac6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c47f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC47F 13324 bytes
SHA-256: b65f314378901a24491481c56584b176afbb103dc23b9a4e3970665c9e464a43
font_02_sfnt_off0000e543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE543 11028 bytes
SHA-256: 5c7c4e46eabd4a9e349992d459aab010bd164fe2d4df4436e884427572017e80

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