Malicious PDF — malware analysis report

Static analysis result for SHA-256 b397890e3fb257e7…

MALICIOUS

PDF

72.4 KB Created: 2021-09-30 15:54:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2bd641dad85f8cbc7d3797338f696dab SHA-1: 0568b3156114b7236659e053df59cc4ce3ce71e0 SHA-256: b397890e3fb257e7c2a87a305ef18e601579f42c71321cc8e12d56f6a86a6543
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The embedded URLs, while numerous, do not appear to be directly executable but serve as lures to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.tramag.pl/upload/file/20166053540.pdf In PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/batadesovasonipujopexazu.pdfIn PDF document text
    • http://e-instar.com/userfiles/file/29979157210.pdfIn PDF document text
    • https://mabuksusu2.com/contents/files/xusexosipizukepiganuda.pdfIn PDF document text
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/35314047828.pdfIn PDF document text
    • http://sro52.ru/uploads/files/pusetexiwilinoxugukar.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/kumejasatovodu.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16132173d8b8fc---98136342054.pdfIn PDF document text
    • http://linza-market.ru/upload/files/35816384563.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/8589836327f748fc3b4197792024c8e5/30799822539.pdfIn PDF document text
    • http://cesarrodarte.com/userfiles/file/meduvexonaxomubikeket.pdfIn PDF document text
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/29306436553.pdfIn PDF document text
    • http://1-sanya.com/blog_images/blog_/file/bugabowapiva.pdfIn PDF document text
    • http://valkexclusief.reviews/app/webroot/files/userfiles/files/71349843241.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/5930620725.pdfIn PDF document text
    • http://www.florentmaussion.net/userfiles/File/gavenopunufej.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/64929424466.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/benami.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/rekinobuxenomejibin.pdfIn PDF document text
    • https://leanuslab.com/UserFiles/file/bosikifilitenajolumo.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/23736530985.pdfIn PDF document text
    • http://oodow.cn/upload/file/2109031147259960903wm90hxtgc44.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/jedowezepam.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/91881912070.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131bb88f1825---jesakanaveviware.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=polarr+24fps+for+androidPDF 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_off0000b464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB464 10460 bytes
SHA-256: cd9b109a62b5b518601cbde6fa2a090a2e56966e5f79c2ce05292dd3bac42117
font_01_sfnt_off0000cc3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC3C 17724 bytes
SHA-256: 2d6bb18ef5e85a1c886f87d05a80aee2a2df7bbea272f6cd96c44ab00ecb667b
font_02_sfnt_off0000f9fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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