Malicious PDF — malware analysis report

Static analysis result for SHA-256 52e4e1d643690418…

MALICIOUS

PDF

91.8 KB Created: 2021-06-28 14:30:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e87f325a8ce85f868a8292f20a537b00 SHA-1: 033dbcac4595629dc3870a590bf7e171a14e4320 SHA-256: 52e4e1d64369041801983b866e8e62b6b860fa0098a94599ff3848d07e303788
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm hosted on compromised WordPress sites, with numerous distinct hosts and URLs pointing to PDF files. While no scripts were explicitly extracted, the nature of the link farm suggests an intent to redirect users to malicious or phishing content, likely leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/as7nagkjcdijm68kh581lpb8m3/54098461944.pdf
    • https://securityguardsupply.org/php/uploads/file/89301654504.pdf
    • http://www.deco-interieure.com/userfiles/file/favonivokolejulilof.pdf
    • https://triangle-electronics.com/assets/userfiles/file/83812267536.pdf
    • https://securityguardsupply.org/php/uploads/file/29658153748.pdf
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/ad74e6eed7951d464911edc5d28ef104/37410266335.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a704b40d8ea---64394008354.pdf
    • http://www.pattyn360.com/upload/forum/files/rofovukogafezasufakok.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/4eenqo6fnkugrh8obbf5oej75s/4865916013.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e297c260a---tawotizowisozexonesoxolez.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/9e3foi5ooblcl4altj9m9i0mi0/kokopujugomatelavuxida.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/96db916453378218b9225769abf4e3b7/50462920866.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed54187b07---30155179567.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f796aa850---zejepakolemixuboz.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/adac894b12676d3fbf1c78858239343b/72375961972.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/dacd2ea16798b4a9c3ade60ca07aec53/nutaridare.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/b867be1ebfadbc455ce9ae4ba1ca1a74/kagonevilopisidofibetiw.pdf
    • http://leaguengn.com/userfiles/file///4379434789.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/orng0h1f8ndanirobhl2rcf6ke/kewozajupawajomizexejov.pdf
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/45512239320.pdf
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/670864398856d0ca362412cbb80746d0/80659546224.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d132643698---70906986914.pdf
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740370ec33d---55811979732.pdf
    • http://drivingschool-brno.eu/files/puralok.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=pillars+of+the+earth+world+without+end
    • 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_off000103e4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x103E4 16792 bytes
font_01_sfnt_off00011bfb.bin
fd0f5b91c365906ca9496ae377af95fe807093e82fa33708da9cc9cab833b010
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BFB 10636 bytes
font_02_sfnt_off0001344f.bin
b8a78529c288716e2806d6c9fe9f91a34b560f92c7cb86b30b88140b535bf730
pdf-font-stream PDF embedded font (sfnt) at offset 0x1344F 17112 bytes