Malicious PDF — malware analysis report

Static analysis result for SHA-256 696b80847e91fb66…

MALICIOUS

PDF

84.5 KB Created: 2021-08-16 09:53:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d3a12a27578aeda4b8ecf9477be2683c SHA-1: 10ce2d90f29d7c81f8038e674713836ee3c1b3c0 SHA-256: 696b80847e91fb66e5a7cdc901f81a2838c7cbaf0581ed4d488cbe1d6959db61
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting it functions as a link farm. These links likely lead to phishing sites or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://backkwang.com/userData/board/file/gipusitebolar.pdf In PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609858778e987---kanupikedalivos.pdfIn PDF document text
    • http://xn--80adic7alej3d.xn--p1ai/userfiles/file/11895817042.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a7c69f35a---18116536896.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/jisufipufafawewesefeta.pdfIn PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/jemakesizuzowedig.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/nozanor.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/16343953244.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608113c134c34---gitikuto.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608a049ee2449---73254222727.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/40497591892.pdfIn PDF document text
    • http://fourfoods.com/images/files/kizinawad.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/19236367560.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/runikanemamufepuleku.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/93447743370.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/60449090181.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/tewura.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/9gtr2n7mm9qho1ah9e225let8a/madusumizur.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/tewuxelanurakuminul.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/hd2sp6bqmar3nlkf3lck6nptv1/52972739281.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/givokijovezoribev.pdfIn PDF document text
    • http://oxi-dental.ro/imagini_ws/48180133153.pdfIn PDF document text
    • http://eis-pieschel.de/UserFiles/File/luvomusa.pdfIn PDF document text
    • http://suara.ru/img/file/50265160376.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=game+boboiboy+run+mod+apkPDF 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_off0000e609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE609 10728 bytes
SHA-256: 16ac5a803bc41f3e4f742711a63f4d1e7dc70113b5f1ca5dd1cb33ad9667bd3b
font_01_sfnt_off0000fe67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11679 16944 bytes
SHA-256: 80d992e94628fb3500359ca3e77a20c5f5667741477d25f79023a47371226f26

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