Malicious PDF — malware analysis report

Static analysis result for SHA-256 50836f421c97fe33…

MALICIOUS

PDF

80.5 KB Created: 2021-09-18 21:13:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 1214d44ec24a547ffbf41bb745d8df4e SHA-1: 6a8d4679b1b397a2c63f86c0165dc9f7f55c74b7 SHA-256: 50836f421c97fe33670e7e2a12df868e4001a3bd4fcdb0b667cde5242433a9df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to files hosted on domains associated with compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these linked PDFs. No scripts were extracted, but the structure suggests a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://greensquares.in/userfiles/file///zizefuvasizovuzo.pdf In PDF document text
    • http://contextuae.com/resimler/files/75568798546.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/gasigisupapanuguwipiluv.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/lpqjmabmukqgbo4ai36nacc613/29754606127.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614002c2706d1---sotabajaxivuxitasovoputaz.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/jititimenulesagal.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/9251499049.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/ruvediradox.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/buwulobozutiliwof.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134642f14231---82141387633.pdfIn PDF document text
    • http://uslugi-ogrodnicze.pl/pliki/File/batujola.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/77936719972.pdfIn PDF document text
    • http://cheapmarkt.com/userfiles/file/38381953507.pdfIn PDF document text
    • https://ntc-container.com/upload/files/72855499562.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614093c3a234a---23384815291.pdfIn PDF document text
    • http://mcserpenti.com/userfiles/file/sunudonuv.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/69866868029.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/35217117300.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/zunetovujutufumepawexegu.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/46313386204.pdfIn PDF document text
    • https://conrays.ru/f/data/duledanaxawuwirivelow.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613013853bce3---dalokodubupelofopef.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2891b1046---xisazuweninode.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369add5d420---61149932386.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=hunter+x+hunter+anime+arcsPDF 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_off0000d7f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F8 10520 bytes
SHA-256: 43e61635efb6df8281ff9510b12dd9d6b06d1e1ea20f839e9e7eafe6e6508232
font_01_sfnt_off0000efb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB1 17148 bytes
SHA-256: 7e7133e4e8e89ef7d26615fbd26ad2ce0415ad0b96eb3230bcc5568e2901c701
font_02_sfnt_off00011ca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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