Malicious PDF — malware analysis report

Static analysis result for SHA-256 847b12473b976ce3…

MALICIOUS

PDF

87.4 KB Created: 2021-09-05 07:10:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 08bcefdaf9b42143a31ec15d56626b2c SHA-1: 249486d54721dda6d1c6b1432f374f84c41a1c4f SHA-256: 847b12473b976ce393411811fffeae17a144190374cee34e263ff9c122e53c6f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution via these links. The embedded JavaScript is a common technique to obfuscate malicious actions or redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://afghansolar.com/userfiles/file/68250691907.pdf In PDF document text
    • http://harissarantis.com/userfiles/files/87356676016.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8a399e786---larujeg.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wojoxagafugofapamakujude.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/defojamagodakopegosaga.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/52956105470.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/20831005659.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091649d33482---tedatidepakuma.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/12938579742.pdfIn PDF document text
    • http://kxzyjy.com/CKEdit/upload/files/79968084671.pdfIn PDF document text
    • http://billsky.ee/files/file/97494219758.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/3fb037418548072839afa7a21217963a/vakemali.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f3bab0e8c---wefaxutam.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606e1a551e1f2---45484144438.pdfIn PDF document text
    • https://haidangpc.com/contents/files/wivosizina.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/fupilerisegib.pdfIn PDF document text
    • http://granitemountainranch.net/userimages/pinekowojatuzajutuzex.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/80176638003.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160dd65a294536---vigibesotu.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/bukab.pdfIn PDF document text
    • https://shoreluxurylimos.com/userfiles/files/vejusozutapi.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/pibateb.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/f66c67374c07647d061bb02f1e10db5b/pozoweselewawivum.pdfIn PDF document text
    • http://stallingreunion.com/clients/a/a3/a37dbb3dca22f8cb40f44de83fe48269/File/zowaxanerevusagepegogo.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/33645678817.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=electromagnetism+principles+and+applications+lorrain+corson+pdfPDF 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_off0000e98a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001019c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019C 20100 bytes
SHA-256: edf2b2dce0bbdf026f8a752b3235638ff0f2de147187cfb2dee1875f0ae55271
font_02_sfnt_off0001360b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1360B 10948 bytes
SHA-256: 7a67a2a64c92212276790fc5f5e922052155f5ef3a5df040b4c2ccf1288aa6b1