Malicious PDF — malware analysis report

Static analysis result for SHA-256 5787c79fe36c76d3…

MALICIOUS

PDF

88.1 KB Created: 2021-07-08 20:04:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3e394dd402acf6bca003c4f92c6798bb SHA-1: f308ef16faff4459ba6eb044686e42e43373e51d SHA-256: 5787c79fe36c76d33cfb126adba8ed1fa6cce3e2d1ea6e626d8a676d6f8665f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to various websites, many of which appear to be compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of a link farm suggests an attempt to obscure the ultimate destination or to manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://riverside-plaza.com/upload/userfile/files/xokevanewajilat.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/c787e739d97c568b1795811e451a5e7e/jatejosewuz.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085c37588081---bokuzosapuvemazobadefomo.pdf
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/589a35ad095d1cb9f51c49dee67961c6/jibimusowafatadijitapu.pdf
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/1d1f7001c4ad36c8d55f33ee8cb9d11e/rapinekesakopojaxisaku.pdf
    • http://jamessham.com/admin/usercontent/file/92293276702.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/531b7fd3aab53ef24d6bf3a6d0c7067d/pisupomusitin.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ed92b3cc6---17945483618.pdf
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/lit8jhjhr7cdprnkhckngsbvlj/66441702394.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098cf677f892---pebuzikikavusaroriwap.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a189091462---57801389676.pdf
    • http://ca1970.com/clients/10044/File/jilirilejuturofa.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/273bd8552ecaca0e2bb2ee8f6a9748b9/muras.pdf
    • http://roland-toys.eu/userfiles/file/15449913837.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/adbf57b85d5c5e22532b86bc954817d8/43102852564.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b279e98881e---93625982132.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/f3a28048a70dcb04afdf1dd80d375e9a/8578096940.pdf
    • https://n-zvuk.ru/upload/file/92080259964.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/cddc2bfddeaa346fd7a5d96719370dc6/22414851460.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/a2175d5d32772302dcbb0852acc8828d/nesew.pdf
    • http://nacyc.jp/Upload/file/lexuxovinona.pdf
    • http://banhangcongnghe.com/upload/FCK/file/95227851680.pdf
    • http://tablica-nieruchomosci.pl/uploades/fckeditorfile/93404799747.pdf
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/74nqkj6sec1j7ljutdlj0s45up/35638601198.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc49f0e8f9---zaruwalureneribipavowime.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=message+to+myself+in+the+future
    • 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_off0000f4b8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B8 16792 bytes
font_01_sfnt_off00010cca.bin
bd630ee4198158249589b82312890c771c940c692c67638560b96d4412da777f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCA 17404 bytes
font_02_sfnt_off00013a42.bin
153d2599ebc743c1e18dc20b933ed016fa97a64ba27d2e2af7ca838c191f6793
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A42 10868 bytes