PDF malware analysis — malicious · f14e3b7866951167

MALICIOUS

PDF

85.0 KB Created: 2021-09-01 09:28:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: f0997a857b29c718d79d53f41114bddc SHA-1: fa193f5e740c16a4b355a8705b82bee5cbb8a9ec SHA-256: f14e3b7866951167d82fc502656b5828fedc8d825fdaa1613fbdcfe2d65c6a5e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm on disposable hosting. The document body is heavily obfuscated and appears to be a byproduct of the wkhtmltopdf tool, suggesting it was not intended for direct user consumption but rather as a container for malicious links.

Machine Learning

Nyx PDF Classifier malicious score 0.9934

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607774d4940f5.pdf In PDF document text
- https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/f5vfkompf0eip0mfeaegkkf343/sabujamigemoduf.pdfIn PDF document text
- https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160968f3c4fac7---42587426130.pdfIn PDF document text
- http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/b1f94ef4fadfcd1644c44e8444726b98/8747975641.pdfIn PDF document text
- http://ladue69.com/clients/876446/File/dezogegunozodejafagoba.pdfIn PDF document text
- http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f4fc2790d---11397995735.pdfIn PDF document text
- http://taiwanglassgroup.cn/userfiles/file/jebekopope.pdfIn PDF document text
- https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/0edd0a95e27e095621a1a6620d9a9eac/42484824866.pdfIn PDF document text
- https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/ba34c37eb3fe0353b8378b566ae02c61/lebujorinevipowi.pdfIn PDF document text
- https://leuphuotcamap.com/uploads/image/files/bolabuza.pdfIn PDF document text
- https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/0henqtac8o5f5itl08joog4vm9/2441848662.pdfIn PDF document text
- https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/d8fee4f417e9cc45bfc0a2a267470d09/72100226674.pdfIn PDF document text
- http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/5b52802cdd51701b9cd6e486c2e0d0e7/30967925593.pdfIn PDF document text
- http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16091128c0ce4c---9231185083.pdfIn PDF document text
- https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/c4782c962c157efa949464993ab0dfe1/jurixopalo.pdfIn PDF document text
- https://travelworld.ro/userfiles/file/zemivulugiwimamil.pdfIn PDF document text
- https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16087c6670e49e---98443548027.pdfIn PDF document text
- http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082fed26ec93---fapumapinuguz.pdfIn PDF document text
- http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160e527cf4d8ac---zikogojibob.pdfIn PDF document text
- https://motoquadro.de/userfiles/file/rorevupazogirezukemareno.pdfIn PDF document text
- https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f04a444be5---delenerapufim.pdfIn PDF document text
- http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a1692a73bf7---72309991993.pdfIn PDF document text
- http://spalovnachemolak.sk/userfiles/file/sarovazumisojef.pdfIn PDF document text
- https://akemi.ro/hirek/file/56203253187.pdfIn PDF document text
- http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c59e0c6e47f---67742063572.pdfIn PDF document text
- https://tailormade-sales-marketing.com/userfiles/file/47670690581.pdfIn PDF document text
- http://lookkorea.net/userfiles/file/bazoximovax.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+trade+a+lich+warframePDF 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_off0000e6ba.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE6BA	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000fecc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFECC	17600 bytes
SHA-256: `74db2fe410836538209298c9f8a823077f2450d143571efd9aeb70ba7543760c`
`font_02_sfnt_off00012bf8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12BF8	10548 bytes
SHA-256: `24b0c70bf3bdb267d567e870f6c1a828b4863d6b085ee45328dcdebc0d4e230a`

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