Malicious PDF — malware analysis report

Static analysis result for SHA-256 a132a85031156691…

MALICIOUS

PDF

84.8 KB Created: 2021-09-17 05:59:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7bb2c533e04437ad1816229d9bdde34c SHA-1: 0cd5b569743b1d9131fdfc7c983cdb9692fc01c3 SHA-256: a132a850311566912f2a01c6e1f218578c3d73e8ec86655e27d0b432a8010e32
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of JavaScript indicates potential for malicious code execution, likely to facilitate further compromise or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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 http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/59264051975.pdf In PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319fd155630---42834121473.pdfIn PDF document text
    • http://etnorom.hu/pictures/79661288903.pdfIn PDF document text
    • https://mgc.to/sites/web/upload/files/gabunarazamix.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/076c869de6f29dedb7eea0e0194d60ea/sebupasubivub.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/4vs8tc4bn2ssk1m3hrne7sg5cs/81606955352.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/juvipebitonubobudolozasos.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/90265230643.pdfIn PDF document text
    • https://ecoolteh.eu/galeria/file/gimapezibidetalup.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/82328447263.pdfIn PDF document text
    • http://greenld.com/userfiles/3770538720.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/56511854226.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eecb43d933---tijenimalagugegedobola.pdfIn PDF document text
    • https://wasael.com/userfiles/file/morukojemewawidapel.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109081952019322.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/63023877801.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/55589852641.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/dozetuwafawexukafuwe.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/a2d606a21283e6238fa7f9d83edfa41b/97192280298.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/voposuniwupotuba.pdfIn PDF document text
    • http://logenamerica.com/userfiles/file/mijuzuwonotetirasurawis.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/sojunisakuxudegebijuta.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/58170898846.pdfIn PDF document text
    • http://wirtrauenuns.ch/images/file/jagewigufami.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1bda101d4---84823845554.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/11036892182.pdfIn PDF document text
    • https://hoanghaie.com/Images_upload/files/99093321313.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=dungeons+and+dragons+online+character+creationPDF 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_off0000e670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE670 10748 bytes
SHA-256: b73d65723b5b17d7c7d4ca5f60920aa9732518ae4ef83b07ac63013b5b897f02
font_01_sfnt_off0000fee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE6 17940 bytes
SHA-256: bc61e0e8dc4e6963a7fc0994515e10d0ae5463c0a8b40632eabd0a15a1e9430f
font_02_sfnt_off00012d2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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