Malicious PDF — malware analysis report

Static analysis result for SHA-256 b077e4b93c4e2e14…

MALICIOUS

PDF

98.1 KB Created: 2021-07-15 22:41:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1e8284f2f8e5e5e8518166c3dbe7db61 SHA-1: fd7ce08a3234492cb90519b807fb516390cabf43 SHA-256: b077e4b93c4e2e147eb74fa177c0f2fd5ec8494be2e52df23defde64b1124f28
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as link farms. ClamAV and an ML classifier have identified this file as malicious, specifically flagging it as a phishing trojan. The presence of multiple links to potentially compromised hosting suggests an attempt to lure users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/161c09fd802b72c5c7c72f09ea6fab38/felibixaro.pdf
    • http://banglatalkies.com/dynamic-images/cms/file/waxesiwubetu.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/0ke7j9t7t0nqkq6vu8qbp4nk2v/kixilorizabizim.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf1e2258a25---27117692676.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c2763df259f---buwuguwewibivaparajap.pdf
    • https://arerp.kr/data/file///46901267487.pdf
    • http://ijdssymposium.eu/upload/35056129643.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/843f53105757b12f6dac41887321a44a/27598001717.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cee074892f---78199546255.pdf
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/6ab99569b5a5db40679582df5cfeb63a/lutapev.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/10939d3b49fc014749c7f357b6721186/larosipufede.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/d3bfeabc33eb5ce86ba3a4f4206e8968/padodozizetamij.pdf
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/f7ce55c2ccb391e5ff5b809c5d2950fa/3414923950.pdf
    • https://livre-d-art.com/ckfinder/userfiles/files/kikinev.pdf
    • https://tasivn.com/upload/ck/files/24481021800.pdf
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/ec9fb0b4a2d0d70094a8969f809e0f7a/vesatadivetowot.pdf
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/17f66a2462c27774dbfd345517a45992/62845314663.pdf
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/6dc2e122bc84cfd478b0ebb9d788e586/35941429830.pdf
    • http://hilltopperalumni.com/clients/9/93/936f23dc4abb03f6d4a1aae2c8a32781/File/nerovugatawuj.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b65344f37---40669777693.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a843086fa10---59032229813.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8be7ebdf9---681120331.pdf
    • http://immodraft.nrw/images/architekten_agentur_images_/file/12775871729.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=all+inorganic+compounds
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e42004e259---nejizodeka.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011f95.bin
3a5fb9e757e2ffcda55f85609636badf975d4d433efaea89c77eda00861544b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F95 16580 bytes
font_01_sfnt_off00014ad1.bin
a4e60ae3ab84b3162230daf0b1c86bd2c7e5d6da19d5ed7575300bea1d95ac14		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14AD1 10708 bytes
font_02_sfnt_off00016326.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16326 16792 bytes

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