Malicious PDF — malware analysis report

Static analysis result for SHA-256 72183bd47579a7db…

MALICIOUS

PDF

69.3 KB Created: 2021-09-17 03:46:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 422a0c548160dc468a2208280659d180 SHA-1: f48b001824ea4bdf4d71105bf49bae7027637282 SHA-256: 72183bd47579a7db3ff2ed2d01f397686d9c8e802c5dfaa6feaf77d5ba7637c5
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm or SEO poisoning tactic. The presence of external URIs and compromised CMS uploads indicates an attempt to redirect users to potentially harmful content or exploit search engine rankings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://crewmak.ru/uplcv?utm_term=pvz+heroes+hack+gems+apk PDF link annotation
    • http://beachfirebrands.com/userfiles/file/lewidofud.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/momezunido.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/27363617238.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614082119f929---febonasajobomozunamufisa.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/digogomib.pdfIn PDF document text
    • https://butyfarm.mm520.net/userfiles/files/tivinofune.pdfIn PDF document text
    • http://business-baltic.com/myfiles/dok/vabonasevuforutidotog.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/jawozanuzerasolawigoxebi.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/45019161116.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/86234821946.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/tikujumevuruxibubuki.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/tesinoweditatawobize.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/vamekira.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/paxebabovepekujatojofub.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/gebonuzokurabotovijawefol.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/51672082799.pdfIn PDF document text
    • https://eniedu.com/data/file/20210901125224.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef511f114f---jupusudi.pdfIn PDF document text
    • http://tzsunup.com/upload/32537095734.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613653a80f01a---fuwenuzesigoz.pdfIn PDF document text
    • https://moyaexpresss.com/ckfinder/userfiles/files/mokutovelutigupaxizo.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/82568958483.pdfIn PDF document text
    • http://aptekadc.pl/userfiles/userfile/torawarasa.pdfIn PDF document text
    • http://clubselectionvoyages.net/images/file/68523318282.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_off0000b014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB014 15376 bytes
SHA-256: 5eeee8710c33e78b67b6e84d9580963b43818ba3fe51fa5c2fe0788b9551ed88
font_01_sfnt_off0000d6d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D8 10700 bytes
SHA-256: ca453263338315b7f7892dde0a13ef0ac1c8ab6fa0d7cf33437ec0323717ff5b
font_02_sfnt_off0000ef8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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