Malicious PDF — malware analysis report

Static analysis result for SHA-256 56e414600992fc3e…

MALICIOUS

PDF

86.8 KB Created: 2021-06-27 21:37:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 0ce085188c14ba4925eba57a28295342 SHA-1: ee25b1373849b8cec0ea9fe54b9253f3cf85183a SHA-256: 56e414600992fc3e732a311261b49dd5f2bfd0bbf72176c030c94fc3470a451b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to malicious content or further exploits. The file's structure and URL patterns suggest it's designed to leverage SEO poisoning and compromised infrastructure to distribute malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

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.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/asp8vft9fuooee7cm9o92qfte5/patuvijifito.pdf In PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2163e64ac---xosarozoriluzenuwifali.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094faff8579e---nelewos.pdfIn PDF document text
    • http://lhs60to70.com/clients/3/32/32806278e47d7e4d905c37b1d6ebf04a/File/80432937413.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/timigomomomef.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/e0882bb9a35ed01f3afa6e5e5f401f73/42415298817.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/xexateripaka.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e5170f38e---21641622702.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/c6f4d2dac73b81b30a14f0a063c24ca0/46465967755.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/7fa3cbdc35f3fba4a3762e7d15500ef0/pidubusalijudega.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16093f83cadd07---37921595156.pdfIn PDF document text
    • http://talleresjpg.es/img/file/50993572727.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/neieefvj16vu223n6np4kbj8pu/40277690821.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/58cf85055e00fec2bc26e10e91118c23/takin.pdfIn PDF document text
    • http://salkim.com/userfiles/file/99772846441.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/99536950181.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/44055e64f7a76d61de5402b146cc0d2c/32861086766.pdfIn PDF document text
    • http://xn--2vxr09c6mc.tw/CKEdit/upload/files/pujobegixunuvutiletukom.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608483b1d5b94---51896755248.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f7720cd85---19617483192.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/20053195160.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/36f9bd676765dc77582186f1896aa68d/xokegujifa.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948077af4ac---rojisizovojepuxufepo.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866116d68f3---gowijawakosoj.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/d3df84737f4acf8c76d9eca63ef7d60b/liloju.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/4e38ae4777301c7bdbb1d354c9d2f853/duxetojefek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=english+to+japanese+dictionary+pdf+freePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA00 11128 bytes
SHA-256: aac9b6a3c1fe4aef160dc4b1b8499467c863836ec6c5c375d28ecf95225f48d1
font_02_sfnt_off000113ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113AC 17732 bytes
SHA-256: 4cc6549f1e2017f23707586b4361066d81f946ae0dbc36b5396bbae6903a91df
font_03_sfnt_off000141e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141E2 2528 bytes
SHA-256: 7fb8e7111a840325da1b852f2bf555f58d6be1fbdea3672b19552d81ea3ff9ce