Malicious PDF — malware analysis report

Static analysis result for SHA-256 db62a33cae414855…

MALICIOUS

PDF

82.9 KB Created: 2021-06-11 15:16:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 836c7607966a0c0f56255d23a7473cbd SHA-1: 219c988c876c05252150c53d4ac71c64769fc571 SHA-256: db62a33cae414855ef32a5f7b18d98a3053a09a89abb4ec3a645ce15acb984cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous external URIs and links to compromised CMS uploads, suggesting it's designed to redirect users to malicious sites. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://allytemp.ru/uplcv?utm_term=decision+making+and+problem+solving+strategies+pdf PDF link annotation
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/7j5ucbj2mos79kv58s60qfa4lm/dorobozajimazaxalab.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e203d1b421---2920983436.pdfIn PDF document text
    • https://adikkeempat.com/contents//files/88063566593.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/a273da70e9e26f7946659df06ad6e34a/xotijogeruxasuxufexona.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/10426786308.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/tomcs82avureee9cqmtsle13f4/rofafavepu.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/luzojoxu.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/lvnl2qo1cci3jbf6gcajdaod06/xexifetom.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/7kkv8nbh0iq39c5n30vg77pep0/matomeguwi.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099820c4f6b1---puluzupuf.pdfIn PDF document text
    • https://activepymes.com/pub/file/73279771231.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/21da01ca90a5a34a3765d56c99304a93/dakegaxuj.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/50981426392.pdfIn PDF document text
    • http://sooclose.eu/upload/File/rigejobugajuso.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/21787433323.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000105ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105EE 5736 bytes
SHA-256: cde8b879beff7451da074ebc7d2d1dc865e5bf74f8618253c2a39f23e722a81b
font_01_sfnt_off00011974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11974 10876 bytes
SHA-256: 716bf76604136743dcd6bdb8d2ebdf5f5099fa097e8223d71e85e3ebcb59d696

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