Malicious PDF — malware analysis report

Static analysis result for SHA-256 822dd9e3c02eb962…

MALICIOUS

PDF

74.3 KB Created: 2021-09-11 02:12:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6d2c20786695ee2aa1ac477298fbd85f SHA-1: 5d3075381986ff1f9bb37334b42ddc3a02130b66 SHA-256: 822dd9e3c02eb96281bbdad0ef77a89180d5702ddccd1011c90fc1729e8fbf9d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded URLs are consistent with phishing or malware distribution campaigns, likely initiated via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wastran.ru/uplcv?utm_term=android+datepicker+dialog PDF link annotation
    • http://theffirm.com/userfiles/file/29423076722.pdfIn PDF document text
    • http://www.beautyvogue.ch/Files/file/wululudokedorilokigemaki.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/akq7g1uvl1maqdqhu7ka0ki7ik/favofenisovurapopor.pdfIn PDF document text
    • https://inprovit.com/ckfinder/userfiles/files/lagivawepeperezup.pdfIn PDF document text
    • http://rs-entp.com/upload/file/kuxubi.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/wipiz.pdfIn PDF document text
    • http://vinhthuanvietnam.com/upload/files/rijodidulosowepukogumon.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/b4ec97402562f56236d46559f8798e6b/28636867982.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/vegagikebegiwobi.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/58434720780.pdfIn PDF document text
    • https://dyaa.club/uploads/file/mebajinupuzemutikojuv.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/75721546901.pdfIn PDF document text
    • http://renknh.com/ckupload/files/40779764428.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210903_57C87D76632D3892.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613214506a9a0---70207888320.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/qsai3ae6ct21mruhegpiv66am1/wovotavokigege.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/lexopabomiripu.pdfIn PDF document text
    • http://prosquash.by/data/duwuzimomojuzim.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/11585045425.pdfIn PDF document text
    • https://gogreenonline.net/userfiles/image/fckeditor/file/41826556805.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/30741961755.pdfIn PDF document text
    • http://sintniklaas.kinderopvangpimpeloentje.be/ckfinder/userfiles/files/gumemeve.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc907af810---dusapasosusaxiga.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/93139947349.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_off0000bf46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF46 17212 bytes
SHA-256: 9bc47f9dc0b5b5ffd21bccb7c66385b56e1d50495bb578fbb1b21920fd0626d2
font_01_sfnt_off0000ebbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D6 10596 bytes
SHA-256: 69784f8233e76e5463e1e0b3ce58457caa0207f2d6ced5453b460f5d2d6c3f01

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