Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e2b48737a465123…

MALICIOUS

PDF

92.8 KB Created: 2021-07-01 15:53:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 049fb576118cad0b1774d3312be7421d SHA-1: f1ca378e56a6f7882d5348c16ea3f98308f68973 SHA-256: 8e2b48737a4651231cd3a7456ac777c911ecaceb0270660d745ead86034ea0a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://catamma.ru/uplcv?utm_term=electrical+installation+testing+guide+pdf
    • https://tramhuonghanoi.vn/upload/files/68300888130.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160afef863152a---19278769793.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/3729938f20a48387585b686deb1c9fcb/61945688883.pdf
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c5f6538de---72241945851.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f36fde5762---23802225878.pdf
    • https://burstallconrad.com/editor_files/file/11238678055.pdf
    • http://amadpich.com/userfiles/file/32528906075.pdf
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/215ad13c3f226c3ad377515362f5c93d/6066642996.pdf
    • http://smithmaloney.com/clients/3/32/32eae1a42220421eddab78da2f55685d/File/49434426745.pdf
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/cd0530d82e259ae0a14e0cc1305ad256/41429582858.pdf
    • http://vieclamquantri.net/upload/files/tijaxinazazimetufuw.pdf
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/4ea8b7437a0fb245329d4e2c694ab93e/96407707551.pdf
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077479418093---78185619546.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/gi1hqhrgimefva1mjg3p8t77it/62106364144.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/8cebd8525ee117c76e4192dcfc91d53d/43035925707.pdf
    • https://dichvumayphoto.vn/webroot/img/files/radebuwugolupomezudifuri.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b208421b0---pavusepigafibizinomod.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/e140c6af88b85f438749507b838490ae/tixetorixotubukoragene.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/11cdcde21455aed7151da083f7fc28ed/29609379778.pdf
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/ahhuc2p8r5q86edjqkco96q0mr/debixinogadelasidenegop.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16093b3dbbe110---77304532887.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab15ff731b2---sazixugu.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607974137bba0---xikifexowevadefiwumapesuj.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/12694161429.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f14f.bin
4b1511348a821a22c73aa5f299ade88355c5d2aecaf69725370ebfef7d092c65		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF14F 17076 bytes
font_01_sfnt_off00011dc9.bin
32a61d067d170ef84ee3f83ad1ba2cadc23e725b0df5007dab6ea629016899fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC9 16356 bytes
font_02_sfnt_off000133c7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x133C7 16792 bytes
font_03_sfnt_off00014bde.bin
d1449efe02a8a1d900eade47742d0cabf7879bbf0185374cfb94cdb039bd3c7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14BDE 10880 bytes

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