Malicious PDF — malware analysis report

Static analysis result for SHA-256 cee234fc22794c0e…

MALICIOUS

PDF

81.8 KB Created: 2021-06-20 07:57:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 9b21f4a54c263836833a9a446e1bef98 SHA-1: 1e1c2047ed9af9b31a2cbf6d722cf63490ce717e SHA-256: cee234fc22794c0eab1b4893dea2c3722fc7e1fe528926d9c572ea6fd7d0380e
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, specifically pointing to PDF files hosted within formcraft plugin upload directories. The document body mentions 'Brawl stars new mod apk', indicating a lure for users seeking modified game applications. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to distribute malware disguised as a game mod.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a2c4cc6d8---dupisowopobevizukexemagiw.pdf In PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b0fe568c3---31168900391.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608331e98eb49---nadaxofujoz.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072bc4966f9e---voxusodufugaluniva.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ca0e30770ee---31261880479.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/bofuxetumuzunanomupu.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/xinasaxamisusezixavamo.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608804e8c9a19---47187745030.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f504f3e4ff---85254155495.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16081c837a9909---47390287342.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c47d2abf02---wesupida.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/dbk1rl3ot0uadk4hh8il30h32g/fizemebokafinolaro.pdfIn PDF document text
    • http://mesterek.net/tmp/70807438953.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad61857c42e---pomajagamaxexuxerexovuw.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/7566260750.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/m9n9285u9d87qm47ustc9e4k59/tovofusobogepuzominid.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=brawl+stars+new+mod+apkPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE3 2880 bytes
SHA-256: aff11289bf87f92bc53c0e2abc335208e29b6db8a954e82fd0a5595ffa95d344
font_01_sfnt_off0000f521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF521 5308 bytes
SHA-256: 727a79ca0b301cd14205b805ee66de7b31346097b9ce84b06961c1b5fa83e22a
font_02_sfnt_off00010724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10724 2328 bytes
SHA-256: 3a3e2fdfb34ccd16219240637fe3ad505de1ffac0755433b77bb8b57f3a32b96
font_03_sfnt_off00011185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11185 11256 bytes
SHA-256: 6c965c7fc03cbbcd8270f33e699dc32f08f484933047fc5b16f2c9da3d018862

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