Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4a558b6dba06108…

MALICIOUS

PDF

219.8 KB Created: 2021-07-01 18:48:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a8673edfd37d677493d1986aae24c1b7 SHA-1: 5313ceba127e3287457d0ac4814d80c00517203b SHA-256: b4a558b6dba061087dc8e03b54bf0006815a2a5104f17addd09b69f4f22c6fd9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript may be used to further obfuscate the malicious links or initiate a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7423

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.
  • 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://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3f2e424d10173579a3077d4842b700c0/45950249199.pdf In PDF document text
    • https://alperbehang.nl/userfiles/file/96108463449.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/jowonixifij.pdfIn PDF document text
    • https://edcasys.com/ci/userfiles/files/36228640119.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4a171e087---75314313674.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/2de02c88d11a8f6e657420fc788e3fa8/bosixuzesisuriged.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/db088c4ff655783defc2f37e8e33de4e/15770089435.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab8b3ba6f6---62699859647.pdfIn PDF document text
    • http://adveotec.com/img/file/gusugatuv.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/jukejoxijokebokovalan.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087dffbc2839---rakoginulilamajo.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e280d3906---lojugagadujuxanonugulama.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/0affb5aa7123e4b92b426c357ef0912e/4339883341.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/23771258005.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090990273199---91046443165.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/87345922957.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebeb107189---zisexosovod.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/14abacb83ea2b49e3b16af9b5b5e38f5/97370963492.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/76v35ubnao3h5nbnmlo6ejji14/65522420168.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/2762953507.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608127125d8c8---50517101291.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/ximurelozaforarodujujazuz.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/1lqijss5aadki1s2tm0b2afsnk/zewopeniwu.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/2834b28554fb946c2beb1e5de4a17491/2998008161.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=spell+well+meaningPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00030185.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x30185 37320 bytes
SHA-256: ddc5adaf79cfd8df17b3c3f190548e23ecaa3319405603b4c552e72e7d02d409
font_00_sfnt_off00021b98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21B98 44328 bytes
SHA-256: 572897d900d0ce5f9d0f6735fd317eb0857384c933371dc2a25ec8a120bbebab
font_01_sfnt_off000292e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x292E5 41708 bytes
SHA-256: 40ba131e5022ab39b94f7821cda875125f1f821abc479a1ca3d4d9436f503e62
font_02_sfnt_off0002ea66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EA66 10272 bytes
SHA-256: 7cc3aae2df8c6b1635b400b638471ad3247a0336645e385c45f0444a42daa6ee
font_04_sfnt_off000347c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x347C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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