PDF malware analysis — malicious · 13ff735c4c93ca06

MALICIOUS

PDF

85.7 KB Created: 2021-08-01 20:53:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: ea55b415479094ada4b5e983df8ef061 SHA-1: 4cb7d43174d4457dc0faed56330715b72cfc5951 SHA-256: 13ff735c4c93ca063968fe720ce6d73eab0797704b6281b0332838cb098d63e1

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised CMS upload directories and disposable hosting sites. The embedded URLs, such as http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/mbrb4n9qm4orgf2fiffvho2l8i/dobigitutidefawepi.pdf, are likely used to distribute further stages of an attack or lead users to phishing pages.

Machine Learning

Nyx PDF Classifier malicious score 0.9860

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://sns.hu/_user/file/zivuzusefosebosok.pdf In PDF document text
- https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/6iuo8j0j1bl4agbpottq65q0r2/fenovabijitolajum.pdfIn PDF document text
- https://eminencesolutions.in/resources/userfiles/file/loburarex.pdfIn PDF document text
- http://guides2alpes.org/uploads/file/jofoxumesoxoxikum.pdfIn PDF document text
- http://au-coeur-du-temps.com/userfiles/file/dakonereludufabeke.pdfIn PDF document text
- http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/29624009893.pdfIn PDF document text
- https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b319e77e022---63908409306.pdfIn PDF document text
- https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b81543590---5487117909.pdfIn PDF document text
- https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/9e5382e8a43ec6811abbb7fbace45363/jaxufuzabi.pdfIn PDF document text
- https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/543f5a3739cc73f55d8873f830751ab5/gumelazasubulonekedo.pdfIn PDF document text
- https://kp-bs.ru/upload/files/pimuxigazanoranok.pdfIn PDF document text
- http://toyotarent.tw/FileData/ckfinder/files/20210618_2DE93A4537E68A84.pdfIn PDF document text
- http://lamelove-zakryti.cz/userfiles/file/13577984917.pdfIn PDF document text
- http://brainerdhs71.com/clients/0/08/084bd9d902c6a1e3ee48703551c87841/File/fufewisogewutiji.pdfIn PDF document text
- http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/mbrb4n9qm4orgf2fiffvho2l8i/dobigitutidefawepi.pdfIn PDF document text
- https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c89ccbbff6---sogibaraj.pdfIn PDF document text
- https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/c35avgiqdel9h7gv54ql8eanvd/35900302660.pdfIn PDF document text
- https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/74cd4ae11ffa0a049260549174edd4f5/defuzakimewimojitador.pdfIn PDF document text
- http://szpk.hu/_user/file/pegutolujusirijif.pdfIn PDF document text
- https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16079d5f43384d---kakujujetig.pdfIn PDF document text
- https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/5c5e7d3efbbfb9c3fd2006db847d94ea/baletenudijup.pdfIn PDF document text
- http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9dee48b94---50839501204.pdfIn PDF document text
- http://moneymaker-gold.de/files/megumibasarofopur.pdfIn PDF document text
- http://zoltysnieg.pl/pliki_wyswig/files/fiborawewutek.pdfIn PDF document text
- http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/1ba4on1gvp25l0d13iihi61u30/89973251508.pdfIn PDF document text
- https://biogenetixpharma.com/ci/userfiles/files/zevupilatuvuzusigoda.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=regional+level+tourist+guide+training+programmePDF 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_off0000e8f2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE8F2	10948 bytes
SHA-256: `8f4784b4367cbb6c69312a279bb3c50652324289cea5f1b646d04cecc8d9e5df`
`font_01_sfnt_off00010222.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10222	17972 bytes
SHA-256: `3336c929e41b78805b7525d189edc8a86348402259d7a3984be614c3901a19f8`
`font_02_sfnt_off0001310a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1310A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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