Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c43befbdc7de455…

MALICIOUS

PDF

87.0 KB Created: 2021-06-29 09:06:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 045a7bd6c8e05737f8ac40e23eab16e0 SHA-1: dfc6a7cdc7cde9e42bc1dff1c2813f0e065e0336 SHA-256: 4c43befbdc7de455839f3994e948c5c378ee1f97fb66ad6f15e502dfd749379e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as a phishing trojan and ML classifiers indicated maliciousness. It contains numerous links, many pointing to disposable hosting and compromised CMS uploads, characteristic of link farms used for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and link farm behavior suggest an attempt to lure users to malicious sites, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://bettaletroom.com/file_media/file_image/file/mutipikafagipelatigogazis.pdf In PDF document text
    • http://animalscipublisher.com/files/upfiles/file/30391358626.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/99634199835.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd3aaa5a68---46824478493.pdfIn PDF document text
    • http://hokeypokeychallenge.com/clients/7/77/77ac66e313b6cb4bf602f1678accca72/File/4202705110.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/38171604787.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/64975420446.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/fb352a0cd36cee8916fb64ceb561fb56/6844495533.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160884da6b931e---35711919018.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/356ab2c32b76f212b7a0cd9bc94a4796/ripijetesijugejewepef.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082f0c66f97d---51192892730.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/42633353729.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/bosunaforirotetipaloz.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/0e020c61d1cecd4af514c8e5e3832714/62113708488.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/23104029774.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607ecec3db24d---77288188213.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/betogixaxuliku.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c6550b1a0---diradanejaxu.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/dc79c54d19e19a91856e09aa99750dca/mabavizeguxaxanopupu.pdfIn PDF document text
    • https://afmiletisim.com/resimler/files/92052370688.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/63523916234.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/a7ln4hd3qhn53j3b0uhnbqq60b/tuxaje.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/a6b482938c338430de8b5ab95e28a75e/12945500868.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=does+oatmeal+produce+gasPDF 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_off0000f2d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D4 10764 bytes
SHA-256: 02800bb3a3c7e91358c86252a45aab3febbe90eccdee6b61a95559b09f4fa55a
font_01_sfnt_off00010b70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B70 16744 bytes
SHA-256: a562198d31bfde90eefbb5f14108614781f42f3444d8f7de6ff00f372c295cd8
font_02_sfnt_off000136be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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