Malicious PDF — malware analysis report

Static analysis result for SHA-256 3398ee1319db7b1d…

MALICIOUS

PDF

93.9 KB Created: 2021-07-05 03:22:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e678df9debde19b820da996cc4c4bca6 SHA-1: aca5e72e0e6567969fadbfbcca917e70756770b5 SHA-256: 3398ee1319db7b1d5a9a407f1452e13a057dc4e6d304709d89fb5128aab3abe2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ClamAV and an ML classifier, indicating a phishing attempt. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, likely to distribute further malicious content or phish for credentials. The document's content, disguised as an exam paper, serves as a lure to encourage users to click on these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/159ebc218fd91ce6895ea39108fe909e/dedixunogilamegiraw.pdf In PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/e05d0f106daf555bbf7bab65243188ca/vefutorafe.pdfIn PDF document text
    • http://freetourscadiz.com//ckfinder/userfiles/files/xoxogujamoxolu.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/94590277410.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/61181724764.pdfIn PDF document text
    • http://gingerbreadvillage.org/clients/e/e3/e396b250b60561adcb946853f9f62e29/File/34470759621.pdfIn PDF document text
    • http://r2doodles.com/clients/4/4a/4a4ed909dcef54c1e3ec6a0ce1d29f2d/File/sibasedikifurekalobaku.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/pujukuzol.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/05fe44d326b9ae6fc1ae83ca1f418534/15075951164.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/f6a0ed19cd125822e822f534b3e280f6/66298261573.pdfIn PDF document text
    • http://titusrelay.com/clients/e/ef/ef304ccc03541e9e6382bef5f13b0a7d/File/mupavoreremixutogole.pdfIn PDF document text
    • http://kfbi.ru/content/file/88909376544.pdfIn PDF document text
    • http://barcelonahotel.vn/UpLoadFile/file/metosekeken.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/100688fcaadc1327ff752beed354b37a/68003386123.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160700c6d36dcb---93615110808.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/jawavanepuborilalinesifu.pdfIn PDF document text
    • https://tmtteks.com/files/pipirani.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f539b03cf0---nulogozazebulonor.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e188ae3c66---gupuzu.pdfIn PDF document text
    • http://westleyden72reunion.com/clients/4/46/469dc9162705cbff2d1fbe132f144f37/File/vixozodazazuzi.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/darug.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160741f38b3f74---rabumeluxedetokujeteled.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/kumug.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/4cea10ec5310f844d419949de10f7385/jotifuwigijazomoresidoja.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/91307982092.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=gate+exam+question+paper+for+computer+science+engineering+pdfPDF 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_off000103e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011bfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BFA 20196 bytes
SHA-256: b4577960797d7e29242fa595f45afb7ce67e96dfe417e86987badb66ebafb344
font_02_sfnt_off00014fd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FD6 11304 bytes
SHA-256: 131c38dce21c9d236278b7c8dd1d757426ea26f93db01a59b581451b2ef89915

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