PDF malware analysis — malicious · 995aaecc98fd46a4

MALICIOUS

PDF

83.2 KB Created: 2021-09-06 06:55:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: 5d039326ff5dce33658f59493a456179 SHA-1: 8dcca905e47ed558df69eedf8b3bf5dd7d4c8ffd SHA-256: 995aaecc98fd46a4ba35af937b52be1090dd716751ceb45b9ba7caddfee5c8de

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The file's structure and numerous external links align with techniques used to lure victims into clicking on malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9780

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 http://billsky.ee/files/file/8304832768.pdf In PDF document text
- https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/1d72afecc0651b64d8a46045f2b75c08/purilutagugulunivo.pdfIn PDF document text
- http://serramentisiciliano.it/userfiles/files/kasabovamorise.pdfIn PDF document text
- http://mobitransjogja.com/files/sixufobirerekodizep.pdfIn PDF document text
- https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/uhvaabqp09cmpm00bks0gldkhm/61504939459.pdfIn PDF document text
- http://kleinschaden.expert/userfiles/file/telanusisof.pdfIn PDF document text
- http://trungtinjsc.vn/upload/FCK/file/66697727114.pdfIn PDF document text
- http://hoinhikhoavn.com/img/files/novowus.pdfIn PDF document text
- http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6605ac210928d0e7322117a966a66441/7379774273.pdfIn PDF document text
- http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160865ba16c24d---48909499383.pdfIn PDF document text
- https://nepalonetours.com/userfiles/files/mopezepowurupikasuz.pdfIn PDF document text
- http://fairway.cc/images/blog//file/17395883835.pdfIn PDF document text
- https://samowar.ch/upload/file/22153981095.pdfIn PDF document text
- https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/f2fd72ca373374aee854fe4657c5e552/69330734738.pdfIn PDF document text
- http://www.nomorcantikjoss.com/file/bosurazikovusezul.pdfIn PDF document text
- https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a104ff902bf---55861118781.pdfIn PDF document text
- http://agriturismolionsfarm.it/userfiles/files/soxujakabebuxededezok.pdfIn PDF document text
- https://www.avantagesapp.com/uploads/files/15996997012.pdfIn PDF document text
- https://2acontractor.it/images/file/87298158523.pdfIn PDF document text
- http://statsale.com/data/upload/ck/files/96851930022.pdfIn PDF document text
- https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16118d74c394fe---ditemaluxusifum.pdfIn PDF document text
- http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bfdaf1ce9c9---nejorav.pdfIn PDF document text
- http://vitanova-cattery.com/upload/file/fuxizavomevorozi.pdfIn PDF document text
- http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/iuvle195f7hd614e99f8kpdrt2/35438792338.pdfIn PDF document text
- http://cinstech-inspect-survey.com/fckeditor_userfiles/file/bifaragugokexigalase.pdfIn PDF document text
- https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/ac6ab9c1572155ad14ccddcaebf58948/1532894900.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=office+politics+book+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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_004_off0000f74c.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xF74C	16540 bytes
SHA-256: `fc306beaa5b340e611fdc43a5832d489ba7cf393a5e4d416bbd2f680a25e986a`
`font_00_sfnt_off0000ceb5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCEB5	15980 bytes
SHA-256: `87af0fb0df758193fe035161ede5df8bf9c8980635fcab8e2d8f6040bbcea585`
`font_02_sfnt_off00010e55.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10E55	10504 bytes
SHA-256: `995c18f835855954c30d1b07d93fea202ebde61a0cd9eb88f87e55c2880824a4`
`font_03_sfnt_off00012623.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12623	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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