Malicious PDF — malware analysis report

Static analysis result for SHA-256 6556500cfb9a7711…

MALICIOUS

PDF

75.0 KB Created: 2021-09-18 01:37:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bf5d8fb7d5442bdd1015c0a59c2a7e25 SHA-1: c7f3926a8dfd40859613dfdd90076c240c28ce8f SHA-256: 6556500cfb9a7711041053dc4494af8eee160e4c520b69606d5c6eea08e4b1f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains or compromised WordPress sites, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://queure.ru/uplcv?utm_term=universal+unlock+password+for+android PDF link annotation
    • https://eurouniversal.eu/ckfinder/userfiles/files/59768496662.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/75865435501.pdfIn PDF document text
    • http://balie.overeembv-profielen.nl/upload/files/bufepezuwawaluxorilegi.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/luxuvalojataritagepife.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/59998484451.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed91e74bec---54072283580.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/50218460126.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/319624235.pdfIn PDF document text
    • http://idevicesplus.nl/app/webroot/files/userfiles/files/565864220.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/62518653667.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/1eee089275f5e8765f0babc081ca45c2/79509120514.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/jenibuzurumo.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad474e85ec---34664083545.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/rilexozadisezudila.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/kekonediwup.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/87576221452.pdfIn PDF document text
    • http://phutungtdc.com/upload/files/82843982913.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/kotejokaliso.pdfIn PDF document text
    • http://citadelcaralarms.com/userfiles/file/79891002449.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/jisev.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/nuwerit.pdfIn PDF document text
    • http://freewest.at/genelir.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/momes.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_off0000c16a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC16A 10864 bytes
SHA-256: 702b443c653487a69b60a32aa508c2e8c75cb4f9df66ef374aa57ab9c68b1078
font_01_sfnt_off0000dab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB0 16952 bytes
SHA-256: c83daf5735409588de4fd6a86acca0f9d1f4566dd05ce68d556f75c7e717aa76
font_02_sfnt_off0001067a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1