Malicious PDF — malware analysis report

Static analysis result for SHA-256 087bee1c54d4dd9f…

MALICIOUS

PDF

83.0 KB Created: 2021-09-04 07:57:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: f401900670e41af63aff3a1330fe3647 SHA-1: 958e1681c56b0c8acb5629a18a04a4118d90c4ea SHA-256: 087bee1c54d4dd9f54430c4be1710e0231e4f4f41bf8377a09414ca83495c50c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was flagged by ML classifiers and ClamAV as malicious. Heuristics indicate it functions as a link farm, directing users to compromised WordPress uploads and other potentially malicious PDFs. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests the document's purpose is to trick users into downloading a password-protected archive, a common tactic to bypass gateway security.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/e0mst7sv8c9dl2l2k8d2984odr/vogorerefidisapaderurazoj.pdf In PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160981a43c15d0---xodobolomufilokaxane.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16088558457bbd---22148871600.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/burozumukava.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6eb0edda15---54139007926.pdfIn PDF document text
    • http://hud101.vn/webroot/img/posts/files/27079810932.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/70693620898.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/431b3c4073dbe3cdea6932ea9cecf3a8/poduk.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa591cef6---fitezevadubenebekatasirak.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/gadikomutisixewirokimo.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/7971680190.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/b396e96104794497031ec2ec342d15d8/zasugedumufulijotijawo.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071375a027ff---bavapijiroguwexuf.pdfIn PDF document text
    • https://mgc.to/sites//web/upload/files/pijuxaforelekaluzavogitu.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/84841021811.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160964def66565---xamixoxuvekereg.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/37734909055.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/a57cc274243f255f9c2ee99f7ca5a963/gijabexefakojina.pdfIn PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/8237993950.pdfIn PDF document text
    • https://blindnow.com/userfiles/file/wewoxawinav.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/laroguzanexegun.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d23903e8a0---difegepasafusamejanerazij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=minhocario+como+fazer+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_off0000dc95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC95 19436 bytes
SHA-256: 152fa391c4f9e0a1d80f2b165cd67f377e8b9f82f65ab572cb88faa51ec30dd8
font_01_sfnt_off00010ce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE8 10628 bytes
SHA-256: 7adc4894ffe5cce57c5eb0fbecfdcd5643d6105855e16d20cd0f25394bad7d1d
font_02_sfnt_off000124fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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