Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbff4fb2711343e4…

MALICIOUS

PDF

72.5 KB Created: 2021-10-03 15:25:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ba47b09b9a01c9318f87782e55d67f14 SHA-1: cf88a106df92cabf12fa684f995963a97e6bb65f SHA-256: dbff4fb2711343e45318b898ff8e171f926cb53b89e7302e1fd170886cd423cf
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, some of which appear to be compromised CMS uploads. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway scanning. While no scripts were directly extracted, the presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics suggests a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://wenyanchem.com/upload/files/nekolisedagusanopole.pdf In PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/o60857hske3au15tmqdte3sac0/77642441007.pdfIn PDF document text
    • http://klemanpince.hu/files/file/sumabitilafowebugaji.pdfIn PDF document text
    • https://tradingcall.in/ckfinder/userfiles/files/vopazawajupixatubavukojar.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/60257415692.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/13551988942.pdfIn PDF document text
    • http://zhuoxinlaw.com/userfiles/file/20210919112155_1847964871.pdfIn PDF document text
    • http://tradotel-riviera.com/file/14030367963.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/bc4d03c4fc10abcba587fde2917f6aa2/71653446676.pdfIn PDF document text
    • https://sushixusa.com/userfiles/files/xerezebelutigu.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd85286b5e---garetejuruvofadafat.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/38483049474.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/tonurotomujav.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/5524777154.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/titezi.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/86727631664.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/40597600107.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/wonusaziwil.pdfIn PDF document text
    • https://ka-base.no/images_students/files/kulotisa.pdfIn PDF document text
    • https://henseltech.cz/userfiles/file/17013809022.pdfIn PDF document text
    • https://griby.biz/ckfinder/userfiles/files/kifutudilinizefaxinoxem.pdfIn PDF document text
    • http://kanizsakran.hu/userfiles/file/xamagobupowobudo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=texas+residence+homestead+exemptionPDF 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_off0000b429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB429 10796 bytes
SHA-256: 118c2c4b04f999d1253e7cd911ab01d0716af44f5e00b176d8b72ce02c807f77
font_01_sfnt_off0000ccdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCDD 18832 bytes
SHA-256: 84587e433ca35e69210b496530b23e1c0384a6761a2447c73b342da29a661341
font_02_sfnt_off0000fc98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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