Malicious PDF — malware analysis report

Static analysis result for SHA-256 945036cf0a5fe4b7…

MALICIOUS

PDF

81.2 KB Created: 2021-09-04 05:10:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b9f3950acfbac2746c02d02eab7400c5 SHA-1: f16e5789012513693c189ce5184b394fd1dba53e SHA-256: 945036cf0a5fe4b75db4d3ff0c76acc9e77ac74efee188cee6f3dca4c3ec9d32
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF contains embedded JavaScript and numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malicious content. The embedded JavaScript is a common method for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://crmloccitanecr.com/campannas/file/dirox.pdf In PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/e87b936eb10412e226acf7db4455c6c6/13518091087.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bef9519c156---bumuzinuwemasivupafo.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/f4f1ca6a7629b88df70bc422ad237403/2493961101.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/sarunexajixoka.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/6df61326abec0d0836eaeeeb46a56766/35271582758.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/a9ffb4f16bee8c5c56233fbc4869b2b8/ludewudipakeruni.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/lobebolonavudej.pdfIn PDF document text
    • http://allycatering.com/userfiles/75659309637.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607616b62847f---ruruviremamokawebog.pdfIn PDF document text
    • http://zhihepvb.com/upload/ckimg/files/202108092051509588.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/70531445514.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/25108052592.pdfIn PDF document text
    • http://goldenpoolandsauna.com/user_img/files/xajewitoxuvakosimew.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/rugunidekut.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3dde6a87b---sifirotubivobowipirugekil.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/hsikldtg949mb2m4i47ltls1i8/2634706219.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/lofevifegixowavamazami.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/16913150641.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/64855929531.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=immanuel+kant+perpetual+peace+and+other+essays+pdfPDF 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_off0000d636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD636 11052 bytes
SHA-256: 33fcdfc7da57e0b68cd7cca0cee6da6d9ddb241fc649991cbdbe116bc86a246e
font_01_sfnt_off0000efc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D8 18184 bytes
SHA-256: 38776dc14f7301b7867fff991146ce98f3491100714efd0b1802fbccf904edff

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