PDF malware analysis — malicious · f1b6ed105103772e

MALICIOUS

PDF

80.7 KB Created: 2021-09-04 18:57:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 6082a7163098366722f686e8369b4e21 SHA-1: fbe678a45cf1505858b87b46dd9e9ee9e7590cd9 SHA-256: f1b6ed105103772eea316b695f2f553d562ee66a435e7224c418ffbe9eeb42e5

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains a link farm pointing to multiple compromised WordPress upload directories and other disposable hosting sites, suggesting an attempt to distribute malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to potentially harmful URLs.

Machine Learning

Nyx PDF Classifier malicious score 0.9917

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://www.lucaslobker.com/minor/ckfinder/userfiles/files/botufamefifog.pdf In PDF document text
- http://weighlessthisyear.com/ckfinder/userfiles/files/24526593114.pdfIn PDF document text
- http://peaceinsrilanka.lk/userfiles/file/23838228303.pdfIn PDF document text
- https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/7e06667479874620ebd772db08bdc957/gavaxilal.pdfIn PDF document text
- http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/55433200485.pdfIn PDF document text
- https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca46332da2---29453730767.pdfIn PDF document text
- http://evolution-dev.com/file_media/file_image/file/wulamomuwadusupedasadeja.pdfIn PDF document text
- https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1a4cb73d4---26834431580.pdfIn PDF document text
- https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/5bb3f3e6cfab137df59f05fa6781fb37/38596674427.pdfIn PDF document text
- http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090b69f3bb4d---tegalidivawasunu.pdfIn PDF document text
- https://majorsagilekvaros.hu/uploads/file/xafivotegigadagatotute.pdfIn PDF document text
- https://rzfmuhasebe.com/userfiles/file/89308186257.pdfIn PDF document text
- https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a1b5b1d678e3e491cbb3314d5b209cc7/muruvibonitovewenupipeno.pdfIn PDF document text
- http://smeclassof1987reunion.com/clients/37165/File/73849745810.pdfIn PDF document text
- https://by-express.com/upfiles/editor/files/sudixonumirematuzo.pdfIn PDF document text
- https://np21bellapalermoshopping.it/file/40376414789.pdfIn PDF document text
- https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/7v54op5orjc5pv60ruv0401u62/81232383016.pdfIn PDF document text
- http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16091cc95e2261---kuzuti.pdfIn PDF document text
- http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1610794a5e9f6a---rozelafumoxonekujakage.pdfIn PDF document text
- http://remaining-mc.de/userfiles/file/badinejaregalowibusekeveg.pdfIn PDF document text
- http://turagent007.ru/userfiles/file/zotupisesedab.pdfIn PDF document text
- https://aslimitada.com/userfiles/file/17832508101.pdfIn PDF document text
- https://goacetours.com/ckfinder/userfiles/files/53200193657.pdfIn PDF document text
- https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/b52dd32826a9d1dda8fe00cb1bc0e809/gavaxipadi.pdfIn PDF document text
- https://bbu.vn/Images_upload/files/72026652755.pdfIn PDF document text
- http://barcelonasixtytwo.com/userfiles/file/tugulugosabalivexogis.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=lotus+notes+8.5+user+guide+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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000d5ab.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD5AB	10932 bytes
SHA-256: `fbdce79821f90dbcb84a7e333c8dc4c244029dd32ddf2c68d3199ef0da1fd768`
`font_01_sfnt_off0000eefe.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEEFE	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010710.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10710	17628 bytes
SHA-256: `996da9c827614442641b2c39971a570c39df4e70cda9e807ba9d28874dcf2697`

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