Malicious PDF — malware analysis report

Static analysis result for SHA-256 912b6883094292a3…

MALICIOUS

PDF

91.1 KB Created: 2021-06-27 05:57:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 9329c5a874e831839bce8d1eabcb0ccc SHA-1: e1fbc7e4e6c46ac38f30a4990810856d972106db SHA-256: 912b6883094292a3b637af9dd580d1fa8246188f814e92b02e756109c26965a2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous URLs, many of which point to compromised WordPress sites acting as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection or download of a secondary payload, contributing to the overall phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

Heuristics 7

  • 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.
  • 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 http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090049f2926e---mugalerudovilutiroxowu.pdf In PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/7288d07fe2391a139d883198f87062ba/91991449084.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16077f051764fc---xebagaf.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/86747dd17b84f0bf243b154fc13ecc97/lowilejusugu.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/71156691736.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/bufibabugifinotaxesatigez.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b60277600a9---runerabinasitotenaf.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/barosamavitulixotav.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/41263300331.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/fc14f853e0e993f94d4398a8cbc77a74/kuxozenepi.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/13013222261.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/b18ed1ee2b1366d9abf3f141dcc13227/64937191593.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c28f0c49c18---monuzonafadoxidilujolu.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f26d9f2d2623388a6fba7bac1e53cd16/82803651442.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/8449738416.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f242caa5a---87863475911.pdfIn PDF document text
    • http://dermaktif.com/imgup/file/74758447931.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/k76v5do8phv0itm792f2qgkm17/dumuvofube.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/2ec63f0711ca9092c9ef0d85d135c7b6/tujijubusakonipedin.pdfIn PDF document text
    • https://maribon.net/app/webroot/files/userfiles/files/88739178519.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/1m06470o3cfgc253dfrrvuors2/mujadagor.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/44tkrsiegia4re6qaov69j9fe4/witomokego.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210527123647.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/gomatobixijuzegabagivipuv.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210620121415_vg331o.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/fegizamojenekiletagoxepuz.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607026429c5dc---sakevadaba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=chinese+ear+cleaning+near+mePDF 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_off0000eedd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDD 17860 bytes
SHA-256: d7f6bba77a37a42c1e8e2f7ea8ecefd572051e6d4e301f12c8eaeac21c115d2c
font_01_sfnt_off00011b94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B94 10492 bytes
SHA-256: 3eb6a3c4b49634707b59b958ca4c671826d33c47a219fa4466b4bd0a1032b2bf
font_02_sfnt_off00013336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13336 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014b43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B43 4960 bytes
SHA-256: bced2ce548aab36f3e60e35f56c698bf1bab83e1c48ac55eec676b8649d5f095