Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf66de04d768effa…

MALICIOUS

PDF

94.3 KB Created: 2021-09-04 20:11:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 37b0b1a54046f1282d0d50c197f2433d SHA-1: a0e83d271b04d8754d87a91b2aefa964afeb66ab SHA-256: cf66de04d768effa303d4fc0dd1203f95a13298e66f018b27987f94ee5ae3437
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting. These links likely serve as redirects to phishing sites or malware downloaders.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16085744a9c5eb---xonozuboxarog.pdf In PDF document text
    • https://weborder.cloud/userfiles/file///53942770916.pdfIn PDF document text
    • http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/tejifatesinajujawosofi.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/ichcdifdh170om9sia91lutn37/lapowab.pdfIn PDF document text
    • http://fritz-fahrlaender.ch/download/rawumotififone.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/legerurevozujatim.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/15680776852.pdfIn PDF document text
    • http://bainihu.com/upfiles/editor/files/3412235163.pdfIn PDF document text
    • http://cy2hand.com/userfiles/18412674700.pdfIn PDF document text
    • http://cloverdiamond.com/file/gosenepukujasogewuwet.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/2070fefc3fb656aec6ae1ff18ba0568f/79205185643.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/98997317927.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/xoragixobi.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/8a77f4177f9a421b59eef30b2ace8c37/bakulibofuwabixixiz.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/3b088c9a401f9f9b2369e33bc7729791/wivikotuxepivo.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/lusegamerefotatatafedulod.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d90d02ddd4---72958322234.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/28360666965.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/vuzofe.pdfIn PDF document text
    • http://sxcec.org/userfiles/file/najome.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160dfc519e1da8---bedifiruxopigivojozubupa.pdfIn PDF document text
    • http://spec-so.ru/sites/default/files/file/25388267937.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/sefibakivone.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=adenauer+novaes+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_off00010770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10770 10404 bytes
SHA-256: 9c3c293d649f41677b8fff0f22dc06fc72bce715566033a98223b36e392d5e83
font_01_sfnt_off00011f23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F23 20176 bytes
SHA-256: cdbea4f887256f09d7d7d0ba35ffce313d442ea90e0729a8e027952dfe49e924
font_02_sfnt_off0001542d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1542D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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