Malicious PDF — malware analysis report

Static analysis result for SHA-256 dae8d63c86b6604d…

MALICIOUS

PDF

84.8 KB Created: 2021-07-19 22:47:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 866c6026a5964724ae2a7b8a1684fe04 SHA-1: 73315bb02eeba0ec00fe5294e8e0f79d7283dbd3 SHA-256: dae8d63c86b6604d21ca76cccc807dd1c5f9b72c14beb78a191361986226449f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The document body is unreadable, but the heuristics and URLs confirm a pattern of hosting malicious content on compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9d0c9fcb9---lokufipufenodazowavagosel.pdf
    • http://www.39koratmachinery.com/file_upload/files/labilusanaxuzododomafafom.pdf
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/1d4a219bcb58bdea038d241e4dcba221/baruzapubane.pdf
    • https://kawanmto.com/contents//files/dobogapovosan.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bba27c3a907---seduwogi.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a13f27f05b---fepovikufilogifiwamepiw.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b953d8c1645---doxusabusa.pdf
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160812bff54586---voliwatiputokiwupotuwa.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b40e2cd2921---46008231954.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7d2cceca8---27655383581.pdf
    • https://giolog.biz/images/bulk_images/files/jokuzozugimajojidivajavu.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852ca3dbe34---vegesu.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/ro54debfhg1i4h1ktc4qi2fv2t/13020615627.pdf
    • http://eakqshop.com/ckfinder/images_store/files/voxetofixizivozok.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aea1daa3070---worojasusuz.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4e34601b8---20543532264.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081dcd06ed2c---gigugusokofesujejivudale.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1eeb11f60---87970244945.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/n6d3a80lradu6g7aordtiiepiu/wegawafigilija.pdf
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071684039aa7---57573416037.pdf
    • http://albino-pitti.com/pub_img/file/62029002409.pdf
    • http://ahkkpcm.org/userfiles/75381224841.pdf
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/205b4b13a2d0e0388d43f90cd8dba33e/mamuludijiravurul.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=spanish+speaking+counselors
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e69b.bin
758b5cc3f0fefee3065ca98f6d41539a36909b2a9a9d240deebff4f74892e3ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE69B 10820 bytes
font_01_sfnt_off0000ff74.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF74 16792 bytes
font_02_sfnt_off00011786.bin
3c62d5a81c73768dad9c1f6db428f5778a5ec31ec31c5fbf44bfa924b54a155e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11786 17816 bytes

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