Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e8dba3456d8a65f…

MALICIOUS

PDF

69.3 KB Created: 2021-09-26 14:49:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5a0973d342ea38066bc2e933d41b7523 SHA-1: 3ec30100c1507e0f23176f93f3df4eec8a957153 SHA-256: 4e8dba3456d8a65feed8470688d12174c9547c0f6cd504df4383c84ae93907d9
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm with numerous external URIs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect users to malicious content, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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 https://archism.ru/uplcv?utm_term=play+rpg+maker+games+on+android PDF link annotation
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/161463b7c960c6---61971340126.pdfIn PDF document text
    • http://riviera.az/userfiles/file/fadugire.pdfIn PDF document text
    • https://giltmorestukko.hu/ckfinder/userfiles/files/pifubibezak.pdfIn PDF document text
    • https://deverfgrossiercms.deindrukdemo.nl/upload/files/juvatew.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/5u8jg9f40ngl7onqlbgtbcltqn/wopawunuxewezekezed.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fagemewamok.pdfIn PDF document text
    • http://eskuvoiiranytu.hu/blog/file/91229637554.pdfIn PDF document text
    • http://wohingltd.com/userfiles/ruwatewofexumure.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aedbf4d6ae---motaxavafeguxasokexev.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/c6ead7b824c1ca48804827c005b90bd0/56140857038.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614273fb8a978---81021248390.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9cad2273c---muzubabexeti.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/dupexiwasedelamovafi.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16143c88c0a759---widawedexadebokima.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/sowaka.pdfIn PDF document text
    • https://artenika.pl/fck/file/91820074242.pdfIn PDF document text
    • http://vpecargo.com/userfiles/file/wadujobitaxabesubip.pdfIn PDF document text
    • https://carolinevlieghe.fr/images/file/35382659455.pdfIn PDF document text
    • https://taptigrihnirman.com/singhania/downloads/file/26463492686.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/tugubefokopavox.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2d277c7f2---81713777739.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/fojazuxewologed.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/1a902777d09cd9fac3df8ba4b3cdd515/tizuwerabewobudo.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/052cc6976bf2b0e9b034e2a016964a15/57281909139.pdfIn PDF document text
    • 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_off0000b153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB153 14944 bytes
SHA-256: e421ba4685320ff049481c99ba40940e8269981d9039a85502c92c420a3ab2cc
font_01_sfnt_off0000d6e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E4 10844 bytes
SHA-256: 768b62a3c17d01072a4619bf913b0ee51bbc9782fbb624e68d6aa600920a8ed4
font_02_sfnt_off0000efae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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