Malicious PDF — malware analysis report

Static analysis result for SHA-256 4915d96304ba4401…

MALICIOUS

PDF

80.8 KB Created: 2021-09-02 22:19:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 67b69c385550aca830b737f95f5e2801 SHA-1: 78bb4e3f79be26930261d77194a550d5db8e0739 SHA-256: 4915d96304ba440146fb080485a1343e2686331d9cd6e151ff26f4b68e20d63c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/ri0lt7jav4bt53tv08oq0le8l0/kifegobobokepoju.pdf In PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/d4630978d33f04e38fdbfde8aafebc5a/lozafi.pdfIn PDF document text
    • http://parkhigh65.com/clients/4970/File/49254101145.pdfIn PDF document text
    • https://globalcareerclub.com/FCKeditor/userfiles/file/66876614667.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c51d014d9d7---39987248163.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/37857704571.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/0jb7l2j6oof9p1uptnn4ugv8sd/vimexilezukudogi.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160d6887d5fc7e---pusopilubo.pdfIn PDF document text
    • https://aedwea.com/upload/foto/85142300131.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe1d972d05---zuxerodotasesidezebuno.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/40948481171.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/jutasijifivot.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/omol35e18t3o1olk1grckgaekb/bogexufat.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/kozipemopumubijawewub.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/lp3clpc28qlbpi4cdjvlf7jrb2/gazepexane.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/nedar.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cc3f620b6ab---5844878749.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/if3kmt0l7nkm50j430qqfbigdn/wubazijapijavaxomemapix.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/posamavelolowajeminema.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/ligigeretupunif.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210602205038.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/petitavifugi.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/1689abfb9a239f2c314286f8bdd77c8f/20413161479.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+merge+multiple+word+documents+into+one+pdf+filePDF 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://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_off0000d6c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C9 17724 bytes
SHA-256: af88aa6b0bb17689d7c66bfe4f062c1796bbd2878099627094345a5934b20430
font_01_sfnt_off000103f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F6 10976 bytes
SHA-256: e1e4424f37de4600b9ee1805c42040ff4c171a82373aea4f33c859b6cbe94fd2
font_02_sfnt_off00011d34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1