PDF malware analysis — malicious · 10e35c3018b47beb

MALICIOUS

PDF

72.4 KB Created: 2021-08-22 08:54:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: fd147ebec52a5368b5814b37f8ff067e SHA-1: 81841d57d668389c579208de1b866a7f25585110 SHA-256: 10e35c3018b47beb2c4197afaab1c3cb3409be4f14184093c9268cdcd9f59333

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The document body is heavily obfuscated and unreadable, preventing a more detailed analysis of its specific intent beyond directing users to external URLs.

Machine Learning

Nyx PDF Classifier malicious score 0.9956

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://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/3bc4fb214ac329f3857021c2958caed4/34944108188.pdf In PDF document text
- http://dblbtech.com/userfiles/file/71682705840.pdfIn PDF document text
- https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/6b0ce1217278932d6c94d3da4adb6c5e/57302164523.pdfIn PDF document text
- http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a0baa6ad1ba---8493335655.pdfIn PDF document text
- https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd9728f05bf---36851450230.pdfIn PDF document text
- https://mkycc4.com/kycc4.com/userfiles/files/zemati.pdfIn PDF document text
- http://chayka-svg.ru/files/46133016781.pdfIn PDF document text
- https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/bijifibokupogunagipojom.pdfIn PDF document text
- https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/opk2k9pk93fej5niu56p9lgqu6/3858929993.pdfIn PDF document text
- https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/9448344306dc2ff14964a5ac2a411a30/26354311676.pdfIn PDF document text
- http://yournamebadges.com/withyourdog/cms_uploads/file/rusuxedizemesuzuxop.pdfIn PDF document text
- https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf6da99b89e---61576569156.pdfIn PDF document text
- http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b488cdb3fd---wisetadalowojexibupabixub.pdfIn PDF document text
- http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609980e46d8bd---kopiferifejalotedoluj.pdfIn PDF document text
- https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609181e84b833---21347601162.pdfIn PDF document text
- https://baxsporthorses.com/userfiles/file/7540092967.pdfIn PDF document text
- http://wahiclassof69.com/clients/874294/File/pododeluvuxegulaboru.pdfIn PDF document text
- http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160abf3b125f9a---81909919411.pdfIn PDF document text
- https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/4f0475cb15f41beebfc1ad355df584cc/73444588357.pdfIn PDF document text
- http://urparitet.ru/admin/ckfinder/userfiles/files/jorodupixeja.pdfIn PDF document text
- https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b633bd874f6---40219707801.pdfIn PDF document text
- https://mashtalkandil.com/userfiles/file/kejaxepupoxod.pdfIn PDF document text
- http://rayer.cn/d/files/47602293447.pdfIn PDF document text
- https://bednidhitraders.com/userfiles/file/xiwadudowufulivaxuzazi.pdfIn PDF document text
- https://micro-logic.ro/images/uploaded/file/suzidexegesesex.pdfIn PDF document text
- https://autoandtruckrepair.net/nbloom/fckuploads/file/ziliwezik.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+get+unlimited+crystals+in+tanki+onlinePDF 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_off0000beaf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBEAF	14080 bytes
SHA-256: `43cd2c96bcff24b534e01a09dfa542bfa815273d70cdd1f66aee288bd6d5e87c`
`font_01_sfnt_off0000e179.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE179	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000f990.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF990	11096 bytes
SHA-256: `a63caebdba075e9846cfc812f751980be973a5bcc56e7bd942fd028a6ec90182`

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