Malicious PDF — malware analysis report

Static analysis result for SHA-256 625fbd0a5faeae13…

MALICIOUS

PDF

76.1 KB Created: 2021-09-19 06:47:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3b0a437d44b3347557411480c64d8097 SHA-1: 721c2c3458c6ed08f31dc7afd3f958487272aa48 SHA-256: 625fbd0a5faeae135b6bd18b004ec23baf6f74f20ea62183bd0eceab3a97d834
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains multiple links to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://nissanotogovap.vn/uploads/images/files/tagowan.pdf In PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/88250874936.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/24140215455.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/ribotolabuxuvimomiwu.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/76296034055.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135701441b4a---42483416815.pdfIn PDF document text
    • http://domki-kopalino.pl/pliki/wolilotukoxev.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/31331171442.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/80050564164.pdfIn PDF document text
    • https://resicolor.com/upload/files/fixuvilumafalozepaxula.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/59251729169.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613143c3b0fab---31386665944.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/37783638041.pdfIn PDF document text
    • https://beldapin.com/calisma2/files/uploads/vazubomeboxivamugagid.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/fosuvamipodabojujikugipa.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/zikatigudu.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/godejikun.pdfIn PDF document text
    • https://pincodehub.in/userfiles/file/5166332492.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/ede3da070b06d5ddab6ced1e1d475b0e/zifiraragisitisexanukuge.pdfIn PDF document text
    • https://nenmongdangquang.com/upload/files/7627856161.pdfIn PDF document text
    • http://sevgineslianaokulu.com/ckfinder/core/connector/php/uploads/files/23345886592.pdfIn PDF document text
    • https://petandpuppies.com/userfiles/file/4163128723.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=total+war+battles+warhammer+apkPDF 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_off0000c6ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6EF 10604 bytes
SHA-256: c53011514a300ac934377bb3a3b182376ee1b353d001d300463e9fae08d0445c
font_01_sfnt_off0000df17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF729 16940 bytes
SHA-256: c7f7d45354a8ad2af2bf2a48b96c958a7f2fd78efde044ea133ebb32fd1dfd5d