Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ae23491d8115983…

MALICIOUS

PDF

90.6 KB Created: 2021-07-05 00:11:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fad72251b7c08fabfd46957b268f35c2 SHA-1: 577b6171f913cbcfd03aa80fd4d676672e085303 SHA-256: 8ae23491d8115983770830ff08ffd6e92045674e7b36e1aff36b1dfd996d8801
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous external URLs pointing to potentially compromised websites or phishing lures. The presence of multiple distinct hosts and UTM parameters suggests an attempt to distribute malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://allytemp.ru/uplcv?utm_term=wow+heart+of+azeroth PDF link annotation
    • https://btegypt.comfile/lexetogefirugo.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/65300307730.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/a7i006au5rte3c1a0uipi28qa3/jasejewutevasojiluxabuz.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160814b9f6d441---tevanikixuva.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/15472563069.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/23g74kriodb0aa81dlu3hobtpp/15473940154.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160755ad242e52---ravom.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/49079845981.pdfIn PDF document text
    • https://unitjaya.com/contents//files/firavilawafinerafemama.pdfIn PDF document text
    • https://kovosluzba-praha.cz/res/file/xubux.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210528040115146.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/6g6s4jhuehd7l6jj438vdf0s8i/puponuwuvul.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///sizitizezofawasuzifenowiz.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/11d3bscgat17uv3ecjg0o1b84q/papevusowibegenigog.pdfIn PDF document text
    • http://1984wnhs.com/clients/2/25/250e0aaa51dad033202e6c34d8602b4d/File/57139169579.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/97943158217.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607aaeed09718---nazomuf.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/nipazulaxavenipinu.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ee9b2f7d3---xemutozoxusozerajososer.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a45b5f8cf08---2908390417.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9f4fcc220---42851649419.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079678dc3f87---tatuwezovalewivuzujasot.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d121d3680871e24f00e951216559a089/jonodaxogeduxukegetidut.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_off0000fff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF1 10040 bytes
SHA-256: 1d6e2b41c884efc63176be6de7bfe7076cb60e201329f0091365ca5252ea84da
font_01_sfnt_off0001167e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1167E 17376 bytes
SHA-256: d4fa8374f68e0bd24a115174687d8473a71ea44e832ae95bff01c7732728a2c3
font_02_sfnt_off000143ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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