Malicious PDF — malware analysis report

Static analysis result for SHA-256 c83a538934bfd4d0…

MALICIOUS

PDF

67.0 KB Created: 2021-09-04 07:16:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cf2df499e1273d8baade60e6abc9f3b0 SHA-1: f032909cfb9f681559aa2b727c83c0362bd8c0ee SHA-256: c83a538934bfd4d02cd846240f6d522b02605edeed0c44e3f8b6690f7fab9326
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF is identified as a phishing lure due to its small size, image-heavy content, and numerous external links pointing to potentially compromised websites. ClamAV and ML classifiers confirm its malicious nature, specifically flagging it as a phishing trojan. The document's structure and embedded links suggest it's designed to redirect users to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 66 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://ecoledesgourmets.com/userfiles/file/50800699457.pdf In PDF document text
    • http://americanpetrochemicals.com/customers/CMS-IMAGES/file/84526211005.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/36312114515.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a5c0bd658---77403454403.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e6a6d0019---jexin.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f0c1c83d3---wilulalefiw.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/nomafavimovuwivegabi.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607aee3154915---lezezumaxadobinurak.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/xabipatogerilivelipol.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/vinawofifub.pdfIn PDF document text
    • http://kudusde.org/resimler/files/63093455186.pdfIn PDF document text
    • https://bamor.org/userfiles/file/susuvalufubuwiwa.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/nepulukadifagabovim.pdfIn PDF document text
    • https://ip-pharma.net/data/files/12054799633.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c59b6e599de---nojunutatepofov.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210725_AF1413D55998250F.pdfIn PDF document text
    • http://protok.pro/upload/files/80836070042.pdfIn PDF document text
    • https://monyetjoget.com/contents//files/furafarunijigowazema.pdfIn PDF document text
    • http://shsalumniauditorium.org/clients/f/fa/fa32e32112b7cad64a7d7e78b95ed61b/File/mekowagomariwogiwikov.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/9416383e13101ea677a09ca8ec174619/bigevojato.pdfIn PDF document text
    • https://telenovella-bg.com/files/fabekulimezulak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=html+invoice+template+for+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.

FilenameKindSourceSize
font_00_sfnt_off0000acf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACF2 10668 bytes
SHA-256: db59b465b69f70e9b58190f8b67f4bfaa1ecd8f5dca5889e5d218109a788e4d5
font_01_sfnt_off0000c54c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC54C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dd5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5E 13588 bytes
SHA-256: 1f237fb1b2e900221d4d02ccf0f9e5029f72222b40eb9d5be8bf60b45bd202a0

Open this report in the interactive analyzer, or submit your own file for analysis.