Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1ff1bb1532778f9…

MALICIOUS

PDF

76.1 KB Created: 2021-09-10 06:33:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5f776d8bbf7eca11f25feb58a414f56f SHA-1: 333886093668e0593c153237e0e60707a5d9256f SHA-256: d1ff1bb1532778f92c9d6a4d98b524de031763ffd5e19c0522d3e264b93eb8b8
204 Risk Score

Malware Insights

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

This PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of heuristics like 'SE_PASSWORD_ARCHIVE_LURE' and 'SE_DOWNLOAD_BUTTON' suggests a social engineering tactic to trick users into downloading a payload, likely disguised as a legitimate file. The numerous embedded URLs pointing to various domains, some associated with compromised CMS uploads, further support this phishing and malware distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://philabc.ru/uplcv?utm_term=pubg+download+compressed PDF link annotation
    • http://onsijsselstein.nl/userfiles/files/12712202294.pdfIn PDF document text
    • http://elard-group.com/ckfinder/userfiles/files/xafilikubumunizikunal.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/70upll5vfd4pd4uh0bh28lnn24/dejumavekofabizepax.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/zagozitibaxivamun.pdfIn PDF document text
    • http://hoilhpnqbthanh.com/upload/file/gezesuzorigifotik.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138529d97427---winixesesapuwitapinar.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/56699153444.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/nusajiw.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/foxojaf.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210902_AE33CCFE4EAAC784.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/jexema.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/rawodekaxulagutanunamam.pdfIn PDF document text
    • http://rambud.pl/uploaded/file/wakepopimifudofuruse.pdfIn PDF document text
    • http://chinazzjx.com/d/files/49553179461.pdfIn PDF document text
    • http://home-hj.com/up_photo/file/686287226.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161304abf04bbb---29755997055.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/debogesatenekixokonupe.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109050622018416.pdfIn PDF document text
    • https://warungmimpishio2.com/contents/files/nejuna.pdfIn PDF document text
    • http://captaincook.hu/userfiles/file/jumuloresi.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613437a5de63a---xovimofixad.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/zawizufonomuben.pdfIn PDF document text
    • http://marymo.ru/uploads/files/33025436846.pdfIn PDF document text
    • http://technoprofile.ru/userfiles/file/kixeteluwemu.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/farofijakabeduverelefuru.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_off0000c36f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC36F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB86 10996 bytes
SHA-256: f62e422b1ee8bf6154369d66b4e3d5da4a62c765a7798a081a59d086ceab5537
font_02_sfnt_off0000f4a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A6 17640 bytes
SHA-256: 2e8d220f53dae2bc88082c56581d66f6dad3586981f1ca202165d728532c2ccf

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