Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ea82a4a81dc7acb…

MALICIOUS

PDF

85.6 KB Created: 2021-09-13 21:31:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7f77a3c3d5fcfd01df4860f7f12963c7 SHA-1: 5874f28de9348ead1054df351f05e69294a897dc SHA-256: 7ea82a4a81dc7acb30c12dc52898909ad7f07c91d58678a15b21914e6945f06c
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://dycmc.com/DATA/upload/files/202109120613341368.pdf In PDF document text
    • http://sitarofindiamd.com/userfiles/file/91079301849.pdfIn PDF document text
    • http://kkagro.com/media/images/upload/file/gepamuturawak.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/43841943024.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/bamugop.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346fbcb4442---junabenarokibigovavalal.pdfIn PDF document text
    • https://olivermilk.vn/tctt/sites/aaa/file/rekifixaxizobikene.pdfIn PDF document text
    • http://pressvaluation.net/FCKeditor/editor/filemanager/connectors/userfiles/file/fogezitaliguwotazag.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/zegisovurebar.pdfIn PDF document text
    • https://melz-feu.ru/upload/84865398841.pdfIn PDF document text
    • https://weilmclainboiler.ca/fck_upload/file/62738569673.pdfIn PDF document text
    • https://gfwofficial.com/ck_imgs/files/dotuxizujusizedevekud.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/mapamowikixelazo.pdfIn PDF document text
    • https://alrashed-alsaleh.com/userfiles/files/16836207150.pdfIn PDF document text
    • http://101balkon.ru/upload/files/wexewemexujuxilikasosagi.pdfIn PDF document text
    • http://esen.life/userfiles/file/rotitagutelinubega.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138dc270388f---ridenuwiwewusozexevev.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/81793842070.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/9144e82f1466544ef4a090bace65c81a/53477824159.pdfIn PDF document text
    • https://edouardweil.com/userfiles/file/zavosebu.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210907120809.pdfIn PDF document text
    • http://xnucleus.com/members/member_images/files/borigikusojozasanupuxox.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345ea53ac66---23418806847.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=games+like+gta+5+for+androidPDF 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_off0000ec5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5A 16940 bytes
SHA-256: a9829a27e02f8ecf912851f7e44d77627004c5e0b3133282d74ae03ef486ca22
font_01_sfnt_off000117fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117FD 10964 bytes
SHA-256: b5331d2f6da5f940e07b9eaf297c4ebe0189195ec15c709ffa4425e0e123b411
font_02_sfnt_off00013142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13142 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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