Malicious PDF — malware analysis report

Static analysis result for SHA-256 b37783b99a11da53…

MALICIOUS

PDF

77.7 KB Created: 2021-09-04 20:56:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0708735f31ff4efb20a1ff5087d91116 SHA-1: 28c078ecdc9fc20c5d631acba312dbe45cfe2d2f SHA-256: b37783b99a11da539db3ddaec533fac68f92947d32bc337edae2c9a669d6b40c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains. The heuristic 'ML_NYX_PDF_MALICIOUS' and ClamAV detection 'Pdf.Phishing.Trojan-d2528dad23a95d95-10044376-0' strongly indicate malicious intent. The presence of embedded URLs and the link farm structure suggest a phishing or malware distribution scheme, likely attempting to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9757

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://philabc.ru/uplcv?utm_term=officesuite+%2B+pdf+editor+download PDF link annotation
    • http://sys-svinding.dk/userfiles/file/83446998176.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/41053638732.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/lewexuxo.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/linamuwa.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/jpg839s840urtu3mi74pf9p1sf/zuwutufufatub.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/2ac8907f54b187598fabf9304ed4f9d3/roxowozid.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7661ad1e0---66399254210.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092bd83a911a---26261564128.pdfIn PDF document text
    • https://bluetact.com/ckfinder/userfiles/files/1750149533.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/24625874526.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606f5e970c8ab---14505094630.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/vfkiu5qlf9uj59csg0ekfdfvm4/82585289535.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/55045592748.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5baab5b6d---68775582448.pdfIn PDF document text
    • https://vendax.ro/files/file/tedivopisexugofedumeke.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/2c0800bc976c1aec16f77f0f42936f88/kolutinakidexibonuwezipod.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfdb46466d---lodilumakize.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/25447077131.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/23364880553.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/regagowuvobadufo.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/goxazevubowaluvumovo.pdfIn PDF document text
    • http://tw-echen.com/uploads/files/202108170049077404.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719a5d1ca40---junur.pdfIn PDF document text
    • https://trieurodata.ro/images/file/84357365694.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/662852016.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/h4am9a51pt7lq7u4cki0apti9b/67153379727.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5AC 17832 bytes
SHA-256: 34ea95fc3badbc2196c05447b11753601fb066c9f8c332d517a57188653bfc29
font_01_sfnt_off0000e1da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F1 10824 bytes
SHA-256: 64467ed667a278f868b442687de9da5aed1a14f6bc2d4cfeb36b4a785c3e131e
font_03_sfnt_off00011323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11323 16164 bytes
SHA-256: a0f26d9ec2bc0bbc84dfb8c1a224a49f7f70479ac92e21d726acd811d43f3bd1

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