Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7e74b36fe1f51d6…

MALICIOUS

PDF

94.6 KB Created: 2021-09-03 13:02:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 102bc2460b5e74ef381aee400aab91c3 SHA-1: f2e0a8163e6de782bd9d3c3b58c43d19a76d7263 SHA-256: a7e74b36fe1f51d685e459e3af4c4d036dc716874485e35c9fd17f4daf6474ad
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised or disposable domains, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further support the malicious nature of the file, likely serving as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4da294b66e---kemojutuwiwikedigavejipuj.pdf In PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a33a692c00---ruwimofuzagofusubuxavo.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/gowazezigurupojiruwuv.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/zegidulibajut.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/86634395630.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/febiwubo.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/59667397625.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7cb95e1dab---vozuxefabusinibikajux.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a825ba6e58a3760a03055d1356dba607/gunuwarobetobaje.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861292385fc---55244379480.pdfIn PDF document text
    • http://monkeytailranchdonation.org/clients/e/e8/e82116dd0b5861b0917add2a69208af2/File/2967087421.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/84426872502.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/22756054813.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/ho417k07drqc95mm6fmil03dvm/66173799049.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0b8ad6a27---zurizatutasetozuzitovudev.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/12968266613.pdfIn PDF document text
    • http://xingyeknitting.com/userfiles/files/4453567416.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/nolirasumiletejobidi.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/20063564099.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/goxibime.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085063c3e54d---43655695887.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd384492f3---68625330775.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd67a08bae9---5546617406.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=new+cabinet+minister+2019+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_off00010a54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A54 11280 bytes
SHA-256: 38c030888b9100cf06b84350b2228b27f081b00d3867cb49cb7dc1c62acd4986
font_01_sfnt_off000124c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013cd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CD3 18396 bytes
SHA-256: 60c246a9cd0bacab483aee4bf0002d82257cab330372b8c3b978ef6045dceb7e

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