PDF malware analysis — malicious · b16db9f01cb64ddc

MALICIOUS

PDF

104.6 KB Created: 2021-07-12 17:14:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: 7ca60c49817416f546fcc154336b5d8e SHA-1: 933a416c5aea909b7e3f4dd0ad520432b518adef SHA-256: b16db9f01cb64ddc067a236e334e8f3e6f78ed2d4915f7da57d3699976b1d5f6

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and link farm heuristic suggest it's designed to exploit users by directing them to external, untrusted resources.

Machine Learning

Nyx PDF Classifier malicious score 0.9919

Heuristics 6

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.
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://travelworld.ro/userfiles/file/dojarikut.pdf In PDF document text
- https://ooo-kenk.ru/userfiles/file/zesujusesonevowusilawobi.pdfIn PDF document text
- https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/3694beefe3fb2919d7624742b2593ad0/wijerolodenule.pdfIn PDF document text
- https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/5778568f85dfc03d35f0850bef9a23c4/7679197774.pdfIn PDF document text
- https://almoheetmanpower.com/public_html/userfiles/file/25859980086.pdfIn PDF document text
- https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/5ac6d6fb1bbbe488c71f515a8afdeee8/xebupadapugopusisedubi.pdfIn PDF document text
- https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/06fd46703996df2454c8431f8667a207/fejadepulonigaridaba.pdfIn PDF document text
- https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/c1eefe273f1664807e93b84291804993/2892723247.pdfIn PDF document text
- http://studiocalcinoni.com/userfiles/files/gazirafumapudexuxegokew.pdfIn PDF document text
- https://cowichanseniors.ca/userfiles/file/54787487754.pdfIn PDF document text
- https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c30c52136fc---37000273954.pdfIn PDF document text
- https://ajansnigde.com/resimler/files/93469477496.pdfIn PDF document text
- https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084cafc61303---37324092796.pdfIn PDF document text
- https://lavaecucebrescia.it/file/fofof.pdfIn PDF document text
- https://gadd-asso.org/userfiles/file/22455560606.pdfIn PDF document text
- http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608966e426790---57265817479.pdfIn PDF document text
- https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607937d9516ca---87827691972.pdfIn PDF document text
- https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/ca21c79e072e62bb9ed353998d41ce90/wefetipezironevegevewux.pdfIn PDF document text
- https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094312c29b96---pabelukajol.pdfIn PDF document text
- http://insureacompany.com/userfiles/file/sadiw.pdfIn PDF document text
- http://szyuangang.com/UserFiles/file///2501552181.pdfIn PDF document text
- https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/stk0kj58p24286530q734tj4sf/nimimuwijetuxudamegof.pdfIn PDF document text
- http://sportingclubalbinia.eu/userfiles/files/zapivomixikaxurenerelovu.pdfIn PDF document text
- https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/e2345bedd5ee6bb6821fef852b29c5b8/mogiposafitimemes.pdfIn PDF document text
- http://partnercable.hu/files/guvatofofovivuw.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=values+of+sin+cos+tan+at+different+anglesPDF 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.

Filename	Kind	Source	Size
`font_00_sfnt_off00013653.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13653	10720 bytes
SHA-256: `a9bc18d1ad73eff2e13bad0c643dd448aa57fa29dba51f04622fde7ed0963c38`
`font_01_sfnt_off00014edd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14EDD	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000166ef.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x166EF	17436 bytes
SHA-256: `473ddcdd14019c461067c8671bdc44e3d495ce82d9bce926c9e5123feddde9d2`

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