Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c739b0a9d027031…

MALICIOUS

PDF

78.5 KB Created: 2021-09-23 04:16:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6c0831a5d066e9efb728b3b41d78e7fa SHA-1: f99feda17b6813160efc3802723891e06e2fdad3 SHA-256: 8c739b0a9d0270316532a12687c7653f8884cbb84aa8b630732bf178e199803e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or SEO abuse. While no scripts were extracted, the structure and URL patterns are indicative of a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://mobile-translator.eu/app/webroot/media/files/78016191843.pdf In PDF document text
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/4980976077.pdfIn PDF document text
    • http://somkuthyoptika.hu/editor_up/gazavoxisudaxunirimina.pdfIn PDF document text
    • http://iltorg.ru/upload/file/zapujano.pdfIn PDF document text
    • http://finance-bulldog.cz/UserFiles/File/radokiniso.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/91289941176.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/62835455921.pdfIn PDF document text
    • http://vinmexindia.com/uploads/pevomonugozulozujekudegi.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/1269c572cb9a1e5da22cf1c92d860091/totes.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/zotafewofokisopi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318f47114f2---23261616762.pdfIn PDF document text
    • http://futuralagoparking.eu/userfiles/files/45389210945.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/lofetomowiritevik.pdfIn PDF document text
    • https://trystsalonri.com/images/file/35620657943.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/35441813960.pdfIn PDF document text
    • http://smm-mm.com/uploads/news_file/21802723127.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/8720453616.pdfIn PDF document text
    • http://naso10.com/userData/board/file/24384602121.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614b706e7fa9c---dabujimijaxa.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/161453ceb34afa---38177660727.pdfIn PDF document text
    • https://incense888.com/uploads/files/202109160344546039.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/jafakoxovukopomix.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161428860ddfc1---86076350608.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/65111436118.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=harvest+moon+hero+of+leaf+valley+ppssppPDF 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_off0000c57b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC57B 20484 bytes
SHA-256: db9e8bea0e903695c780f16f6bed501524431a451869610dd86b49a6a06016f9
font_01_sfnt_off0000fba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B7 10700 bytes
SHA-256: b0a5b46d12c6095a387bfbc4065aa86c5bb81a232cf2562607843b890ad2dc9a

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