Malicious PDF — malware analysis report

Static analysis result for SHA-256 b32a95d47cfa3c5a…

MALICIOUS

PDF

81.4 KB Created: 2021-08-07 20:59:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cb41a299206233c09e62514a285627e9 SHA-1: 92b1545ed764f5d3b69d3120d980ab274b1aa274 SHA-256: b32a95d47cfa3c5aa730c4e0817a20f306c8ee69b338feb752c2542507693fb7
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's likely a phishing or malware distribution lure. The document functions as a link farm, containing numerous URLs that point to potentially compromised websites or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of multiple external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://krisoc.ru/uplcv?utm_term=all+i+want+for+christmas+is+you+lyrics+karaoke PDF link annotation
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/91067303507.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/76539060637.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/bu923sale11uk593273ddpid6t/4163610651.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ef8938c9b---37608803283.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16078c8f40df60---zirojawepinitudutip.pdfIn PDF document text
    • http://jghsclass75.com/clients/f/f3/f322050927ea28328664fd088939ffaa/File/nawavewugefex.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/61787530991.pdfIn PDF document text
    • http://ipublicity.cz/data/file/motoxeteledusijuna.pdfIn PDF document text
    • http://domainecomps.com/documents/files/30788039414.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c084c0e094a---jeburidosifu.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/2feeccafda17786f8551a0d3b79d4e43/nubof.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///90727692219.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/63e11eeec3a5de28a81042c875d3f27d/96249593291.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/garojakif.pdfIn PDF document text
    • http://www.rotudavid.com/ckfinder/userfiles/files/38934058436.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16077ffe3ef4f5---nerodajazesoxovekinudo.pdfIn PDF document text
    • https://voyagerf.ru/wp-content/plugins/super-forms/uploads/php/files/763de14921d794894c49176a1765f079/56263646203.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/9f3c0e5915320f189679ab97e13726d5/selomifudi.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/05/file/202105231121347372.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ffbe8fc04---dibowonazes.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/zixogasesegikeg.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/xosifogepisixili.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d26bcc24747---67610441985.pdfIn PDF document text
    • https://epiphanych.com/images/file/91624253157.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1213c0c33---vuvufudavajirozaf.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_off0000d7ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCC 17380 bytes
SHA-256: 8024324030b6b34a6ad51eabdbcd663c681bb823391f80337058bc9aae3cf200
font_02_sfnt_off00011d39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D39 10976 bytes
SHA-256: 8b2f671859934040b273a8325a305725e8a61cb00a84ec7d143c97c72c2ec5f2

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