Malicious PDF — malware analysis report

Static analysis result for SHA-256 f430e0d44cb2b738…

MALICIOUS

PDF

69.8 KB Created: 2021-09-25 16:51:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 3f5028f64e17a249873f1fc45c4c04c3 SHA-1: d6379188bf651edb0db5f019f47247cec8e700fc SHA-256: f430e0d44cb2b7387108e3520290acaa11c911925e74c7fbc0a3326618679c8a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. Several heuristics indicate the presence of a link farm pointing to compromised WordPress sites, suggesting an attempt to host malicious files or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://autohausnschmidt.de/userfiles/file/35898507346.pdf In PDF document text
    • http://oprandi.it/userfiles/files/zenujupeduwuketaxeb.pdfIn PDF document text
    • https://semangkabiji.com/contents/files/fizasamuragowibukonezer.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/64152864346.pdfIn PDF document text
    • http://oris-am.com/editor_up/86751755806.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/gofeporutiviw.pdfIn PDF document text
    • http://avalon-essenzen.at/userfiles/file/18511328234.pdfIn PDF document text
    • http://888spirits.com/userfiles/file/biralafigojavo.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/a561de0467078613402428e26d42cce8/satebefamoraxizulafut.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/pixaliwopibebimomanosowe.pdfIn PDF document text
    • http://lapempi.nl/ckfinder/userfiles/files/rubuvubameradadivizefuko.pdfIn PDF document text
    • https://vestol.bg/files/file/retavukeraviruwubuza.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/378f6886bfdbfbfc9b2cfaa3af606e3b/50032784983.pdfIn PDF document text
    • http://zulassungsdienst4you.de/bilder/file/9418133047.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6eef1e0ae---55220367699.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614c5c6203714---kanenigujajamidofivi.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/a4cef410dfe744b4f0366e9115df6ecc/sebawaxefutizidimaworade.pdfIn PDF document text
    • http://rtm-plus.ru/ckfinder/userfiles/files/10681869701.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/89882535240.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/desufixu.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c7564e710---zimuziwizi.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/tusedivezunazax.pdfIn PDF document text
    • http://ganteltechnology.com/system/userfiles/file/wapavo.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/renuzomigodidusawetiwem.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/sexefepilogewudunajudi.pdfIn PDF document text
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/37246797352.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+make+your+ppsspp+run+fasterPDF 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_off0000b1f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F6 10764 bytes
SHA-256: 63e0039b1adb6db88e2eb93433dbd650bd4782fb57ac5c3260b2bf81cf585977
font_01_sfnt_off0000cac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC8 15300 bytes
SHA-256: 60c8a4d502a8f38876be8cf8dd0b8d81bdd7d03b58f4d30842f54112798cf25d
font_02_sfnt_off0000f183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF183 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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