Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fca38616eca6d33…

MALICIOUS

PDF

90.1 KB Created: 2021-06-25 21:34:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 53a079901ac2170293ee3484cc5ba0d3 SHA-1: 286b2468066d7a7517c2dc9b12ddbe2d2564c89e SHA-256: 9fca38616eca6d335b1fe0f48a768a6126291022c20ca2193d7d624297299b60
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. It also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised WordPress sites, suggesting an attempt to redirect users to phishing or malware hosting sites. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/3fd2fa570b836f1169f91bf53f5a8f36/pawikajamakebobofokag.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/p9cdnl74974slqh93ca52k1uj3/tesip.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/1ee59286f4bb32dec961aac8c007f579/36743374792.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b19680e5992---98538249860.pdf
    • http://kapsalonindex.nl/images/uploads/zikodujovutazuluj.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/8018347c6da15217a151697f7ec227f2/2940199179.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608200773a0ac---xikubarelekijukef.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736e67a3b0e---89899261678.pdf
    • http://apexnepaltravel.com/userfiles/file/fagadixikupotipifi.pdf
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813a6f4c1e7---jababufovexizikuge.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fabbbb78a7---76272088988.pdf
    • http://ateliergermain.net/sites/default/files/file/sikuwo.pdf
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/548ff9417ebfbfd0828f3655372d7a7b/21843141263.pdf
    • http://classiccar-jp.com/js/upload/files/25352611378.pdf
    • http://shopsuathientu.com/uploads/userfiles/file/58208083393.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/1gkuoc47d5riqdth2ejfd8fqa5/xevelekixarare.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609ddb4613fd6---fetujeduguwodigo.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/fd12bf79eab307e20b2232dcfe85f438/xegawoxojejivoroxo.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/aau03a97upopcrffqrs56o5ko5/nozefaxeboludizakitonutu.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebe9b7e43d---sejavogojadenipexike.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/rg46hdj1c364a5bsv7ilijt650/kuwim.pdf
    • http://msiutilities.biz/documents/dozigeripiwepewog.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/523cc6cade7de252ecd889bc2cf78790/12869856324.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8d8dc0179---81914316113.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1607e349ee0162---satulazowarajufoziwatufo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=distended+endometrial+cavity
    • 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_off0000faf9.bin
37fd4b4adc9fe2d94ff17894e4c416bdbb9650b5c735fa71d1e96529c1ed2e05
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF9 18152 bytes
font_01_sfnt_off00012a34.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A34 16792 bytes
font_02_sfnt_off0001424b.bin
be4686c29261ac093d88ea61a85124bcf884d77ca0d50f7b38d6c8ea9f37b12e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1424B 10712 bytes