Malicious PDF — malware analysis report

Static analysis result for SHA-256 910135ac8ee3a268…

MALICIOUS

PDF

98.8 KB Created: 2021-09-12 08:24:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7a2b8a84f10e7037391177566c6a643e SHA-1: 0b6320d852159ba2c21209054423a17cec17bd23 SHA-256: 910135ac8ee3a268ede0a26dba34f016fb5dbc0a791036dd2ef10fa2826f14dd
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://studiosiriosrl.it/userfiles/files/39177957883.pdf In PDF document text
    • https://warungmimpishio2.com/contents/files/74035228283.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/56821307764.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/zupazanab.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/dapavowodome.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/kejebugonorigojuzitolaj.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e9ef5d842---potorikifan.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/solabejuzawokosamifav.pdfIn PDF document text
    • http://kxxbs.com/uploadfiles/file/a/kifaleruxinojekelonazi.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/titosixetenemodukidimavi.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/rosogox.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/21912037416.pdfIn PDF document text
    • http://ssatripoli.org/userfiles/file/walobidisakido.pdfIn PDF document text
    • https://matharu.ae/userfiles/file/21428440362.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/82872436822.pdfIn PDF document text
    • https://granitabrasive.ro/editor_up/26865775881.pdfIn PDF document text
    • http://185.33.116.142/~bbyacht01/upload/files/11263435579.pdfPDF link annotation
    • http://esenkardeslerinsaat.com/resimlerfiles/sobodesunefeku.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161364ec7f3983---mapiwobijuligizita.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/zavibupibisat.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3a0707949---vizozolozumij.pdfIn PDF document text
    • http://greenflameenergy.com/userfiles/file/duvelesavumalel.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/jaxanugipig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=bloons+tower+defense+5+pcPDF 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_off00011b32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13349 10632 bytes
SHA-256: cb1de9f266b662c49c936b9dfe2f0852f435fd979f4e67247290b4d539226381
font_02_sfnt_off00014be4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BE4 19188 bytes
SHA-256: af05627122459361bd72aeefc55cb8c4997b52d5d9356c5b967516d66ac2b8b4

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