Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7f3243baaeb2c79…

MALICIOUS

PDF

71.0 KB Created: 2021-09-16 00:25:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6f8f8cfbd4773889a4a7473545ea4ee2 SHA-1: 4677f06e5cc477cb7a00f7004086a806657530be SHA-256: f7f3243baaeb2c79729e1a1933ac79a35a84129715e52a10e418470da0c5384f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous external links, many hosted on disposable domains or compromised CMS upload storage, suggesting a link farm designed to redirect users. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate an attempt to obscure the final destination, likely a phishing or malware distribution site.

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 https://ketchas.ru/uplcv?utm_term=minecraft+survival+things+to+do+list PDF link annotation
    • https://principesgs.com/userfiles/file/4407619021.pdfIn PDF document text
    • http://alcantara.cz/data/file/wemakapov.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/dolasatibejejalusurazo.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b05507807e---49461307103.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/68511313586.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/nozujun.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/14407678473.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a86178945---pugonadozakadifovemeban.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/tivexupizeworowuga.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/kifujolopub.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/53740653548.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613599aa4c6f7---namupelakijasage.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/15464090809.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/94355226119.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/47743952399.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142618e884f8---89735356203.pdfIn PDF document text
    • https://dongphuchuytai.com/upload/files/46450161755.pdfIn PDF document text
    • http://qdjshg.com/files/file/nupaluj.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///5713963704.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/vigonakizeda.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/jolazarosabawazoz.pdfIn PDF document text
    • https://netlandschool.cl/files/vapegipotudiw.pdfIn PDF document text
    • 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_off0000b69e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB69E 10912 bytes
SHA-256: 7e01305317dd45b3bda1eb67287cc4f806ccbc15d7352edc13c61effbf2b2728
font_01_sfnt_off0000cfab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e7bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BD 15300 bytes
SHA-256: 83e3547e8ef03b95f9584694df43f2e3eba0b840f53bb3bea3a7155073852103