Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8d3c76bf1e1d030…

MALICIOUS

PDF

101.5 KB Created: 2021-09-01 22:24:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: 02f746972d217e93064912668985f950 SHA-1: 8a13de604ae4917c8967e373101eee0d9c01b58a SHA-256: b8d3c76bf1e1d0302556ee12b37c746b3a7036e9c9416a0d4c610fdbdd1f4e82
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16071bd7a0b862---tubatapamal.pdf In PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ef1c98431dbde92549ee6a5956e4011e/11020815104.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160766af43d01d---sibosakonixopanuza.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c4d8b0562---78681610260.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/xafizapat.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/7d361a8176c0ac488e04e92863b6f32c/3719811953.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091fd5a8c9b3---baromomivukusiwapomag.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/liroramoxisemokapovog.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/18192031227.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4b741b07e---jonotawovaniz.pdfIn PDF document text
    • http://lhs60to70.com/clients/3/32/32806278e47d7e4d905c37b1d6ebf04a/File/93961595738.pdfIn PDF document text
    • https://art-lamps-rali.eu/files/file/26634896516.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/vegolazifetabisikeg.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4524971b5---detuzazavawovamive.pdfIn PDF document text
    • https://daks-96.com/f/uploads/files/jozesok.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/rua46batcjonlceuoe2cbt21re/relepoxobuvonelapokupamut.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f6aaf59c177---xadofonapuwarovu.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160709982a0dda---gimop.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e3dd24dcc---22354051274.pdfIn PDF document text
    • http://wwstationery.com/files/file/pofizabuzopumizidafipiwe.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/digimiviwusupewudewulez.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/81012262992.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/s601bddej6t7kd5i3n6jspres3/sewokafanadowozoruva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=hysterically+crying+meaningPDF 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_off000129b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B3 10556 bytes
SHA-256: 9903e42d5a3dcae285f962f63a57452a0b0cbc84ac0904802998a55da2e4f31c
font_01_sfnt_off000141b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141B5 17812 bytes
SHA-256: a5681821cbfcd0c17782f2891e0016b8bab0a80711459b8a13d9c7f8d711d8b2
font_02_sfnt_off00016fd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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