Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8cca7e294d7fbfc…

MALICIOUS

PDF

85.7 KB Created: 2021-08-31 12:59:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 31844b10dfa95bd015f1b805c39a7980 SHA-1: 57a9c3551d7f4e300d3ad0e9968b8155e890bfd9 SHA-256: a8cca7e294d7fbfc9f3e2bce04c2f8a5f13948e6c47e5ce5a61e39c428f8f191
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains a link farm with numerous URLs hosted on potentially compromised or disposable domains, suggesting a phishing or malware distribution attempt. The presence of external URIs and link farms points towards an effort to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://china-zub.ru/userfiles/file/90287755009.pdf In PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/mumaguvuv.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/45869046960.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/roxosilupudijet.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a15f948313e---zanuzetoti.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed724a93ef---28353846019.pdfIn PDF document text
    • http://boeschfamilytravels.com/clients/43210/File/6192316766.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb416b7c62---59881341921.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/3mpaag52aoat4va8582aojm4ee/15662139417.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa80773e5c2---sivijimubajilonij.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c379b3012---sunakeg.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/wodoxikotugemusisimal.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/ritmg1r2tivau3d8m4gv1trdsc/29473052519.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9b077e068---ronozupubusetekutusa.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/dufevufazosanipirula.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607646c940cfb---51968120762.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1611ad4434e4ed---wuxupetefinamuvufumuj.pdfIn PDF document text
    • https://migger.dk/userimages/file/lunejipaves.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/dugejujuvajatovinefavafi.pdfIn PDF document text
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/xoxemu.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/45859d5064d6513ee0309375d995344d/sarawikodatejajiperikuxe.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/luzezevazomorupijemekatug.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/14171034240.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/fosozukatute.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/zumuwibowasikogijufegutij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=age+of+wonders+planetfall+dvar+campaignPDF 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_off0000e805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE805 17688 bytes
SHA-256: a7259a80536971cfc19c2d80a1c0974af78df06ffd28462133b5e82ac06affa2
font_01_sfnt_off0001162c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1162C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E43 11096 bytes
SHA-256: 401320724eca53a3e72d8a9eab436da4e7f3e26485635dad50c5d0535ec6bd5b

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