Malicious PDF — malware analysis report

Static analysis result for SHA-256 37006f638b7575fb…

MALICIOUS

PDF

85.4 KB Created: 2021-09-02 04:47:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 05536fc153c1894062b8d662e16f47cf SHA-1: 664818d8a708d6a1ab161fcba8a3a2a82cf0d3c4 SHA-256: 37006f638b7575fbefaea0b7bb005e6dc7069db9fb511d0bc427255395b23ee9
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution via these links. The document body is heavily obfuscated and appears to be metadata rather than user-readable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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://laborke.ru/uplcv?utm_term=nice+word+that+start+with+h PDF link annotation
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/434dd44bb9099f64aa8f520adebd38b0/dizabokuxuxutosomikeruzeb.pdfIn PDF document text
    • https://poojaindiangrill.com/nbloom/fckuploads/file/80058776232.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/cn5bct2fv3su2uj47m0ifac3u2/86496670034.pdfIn PDF document text
    • http://thepdaitruongphat.com/upload/ck/files/2395013345.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/susazorimufev.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/wisixebex.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/77816844755.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/8726f32e0df7c678096deac2e8d3f741/33258477139.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/75503406071.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/abfdc2c0863431ac8c56d3e80dcf79ba/80000576858.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc535ab97d---melubuwa.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083d2f778cd3---puxikujetafulifewupe.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/40642458780.pdfIn PDF document text
    • https://fultoys.com/userfiles/sikexutixibonitidad.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/d69535629de5452dfbcbdd22e8bbec98/mejudolosedubebewiduvomeg.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/288e9b9df800798fb3466202d2174eca/lizojufalabazopiwa.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/23306755089.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a6417df29---4800123791.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16088f78a93761---16632404239.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dea8b917a5---bizad.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/nesoxowilofojoviga.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/5314462303.pdfIn PDF document text
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ead7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD7 17520 bytes
SHA-256: 4a6a209bfafdc04de1307432454a280309f778667732278e96e50fd90e055493
font_01_sfnt_off00011775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11775 10380 bytes
SHA-256: b2efd88f54a96d3519c392415fe215c0eaed0aa062674b563ecf3ceae93eca62
font_02_sfnt_off00012f2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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