Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dd04597a0a01c52…

MALICIOUS

PDF

93.3 KB Created: 2021-07-01 23:09:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 65dfcc74416d680db660762bc3d39fa9 SHA-1: 51c50dd20c0eb4e2373d4632d4bda82fcd783f39 SHA-256: 8dd04597a0a01c5207bb86241c41f18f87f0b7d6161ed52939206db87637b291
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS uploads or appear to be disposable. The embedded URLs suggest an attempt to lure users to external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/9b0614f49f2fb1c053c229e8acd9ad5b/nenikiwa.pdf In PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/96989604103.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf5a79ca5c5---61154567132.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3afccf1ab---34835023086.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e99f434aa0---72922566396.pdfIn PDF document text
    • http://sushibelovo.ru/files/23736813812.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/0etjh2rmd5qgp51fmekhm3dva5/figidad.pdfIn PDF document text
    • http://jedwines.com/cmsCart//upload/file/mefafisozapitolekenivani.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/57756200746.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/82278577089.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5da72e8bd---78324508852.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/degedagulisativikoz.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ec9e90a1a---guzowifutikasa.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/172836463fb3ad09840da4e1b81f78da/kizomiluvazulaxinober.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb8dab316d---13222609533.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/saxisegegaguv.pdfIn PDF document text
    • http://vhs1962.com/clients/b/b9/b967f936f519796c2a696a6ed1da67f9/File/42109881222.pdfIn PDF document text
    • http://hopkinshigh1961.com/clients/878968/File/loremonijavediv.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/fezewusazadepowor.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/52636635886.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607149f450b3d---dopuraledevebodaz.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e784ca26ba---69175634679.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=common+teratogens+and+their+effectsPDF 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_off00010767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10767 10908 bytes
SHA-256: 208e064c14a486ae3418663cfc05febd85372529447c11c79e048a5d122359c5
font_01_sfnt_off00012044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12044 18236 bytes
SHA-256: 89b4d51f29504db68c2be58a159a888bdfc9965674ffa84a8173268fa878383d
font_02_sfnt_off00014fe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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