Malicious PDF — malware analysis report

Static analysis result for SHA-256 e63170b2798120fa…

MALICIOUS

PDF

83.3 KB Created: 2021-09-24 03:28:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 954d6011305f35ec5934e3c0ea7dfaca SHA-1: bb0632f105d8ce3d612e24a728340288e2aa3542 SHA-256: e63170b2798120fa44d946426798ce7a8f845b8fd2c43da7775a90747ea54c87
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external resources, many of which are hosted on disposable or compromised domains, suggesting a link farm designed to obscure the ultimate destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of embedded URLs and the heuristic 'PDF_RANDOM_URL_LINK' further support the attack pattern of luring users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://0-50.ru/userfiles/file/zukawelamasajosi.pdf In PDF document text
    • http://lagostena.it/userfiles/files/55604195054.pdfIn PDF document text
    • https://superiorservicesandsolutionsfl.com/nbloom/fckuploads/file/ladoxe.pdfIn PDF document text
    • http://brenderup.ro/mm/file/tupojezapozojedozivot.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/zetokimuwobizenokapav.pdfIn PDF document text
    • http://shiraz.sk/ckfinder/userfiles/files/33840530787.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614151f6db0e3---gituwotazelumidesus.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/nutojuloparudedofisa.pdfIn PDF document text
    • https://fuze-pay.com/ckfinder/userfiles/files/vikujemetadanap.pdfIn PDF document text
    • http://transfertrolley.cn/d/files/71587138813.pdfIn PDF document text
    • http://maysoi.com/hinhanh_fckeditor/file/24354486166.pdfIn PDF document text
    • https://bharatceramics.in/ckfinder/userfiles/files/86656020138.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a462169184---vuriwawafir.pdfIn PDF document text
    • https://swaarm.de/app/webroot/upload/files/88046851136.pdfIn PDF document text
    • https://emtracing.net/userfiles/file/49772874634.pdfIn PDF document text
    • https://redac.ch/upload/pepimapomazoso.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/riwofigidikibidija.pdfIn PDF document text
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/45759208788.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/31446151611.pdfIn PDF document text
    • https://estatecambodia.com/htdocs/cljr/data/files/31721684142.pdfIn PDF document text
    • http://sbsedupatti.com/sbsedupatti/userfiles/file/posubidugofofetidol.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147407ed7ad5---44886115855.pdfIn PDF document text
    • http://yyfxsw.com/upload/files/fizimiwemosirot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+to+change+low+battery+notification+on+androidPDF 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_off0000dc0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0C 10916 bytes
SHA-256: f46227c086dbc70549fb5bddd65df929ccdafbb97a68b9e191b9788f9f033932
font_01_sfnt_off0000f50b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50B 19772 bytes
SHA-256: d5361875a21bfec29a37c73bfe27ad15f2e7629a0c4656e5991870879a77d697
font_02_sfnt_off0001275e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1275E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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