Malicious PDF — malware analysis report

Static analysis result for SHA-256 583b21158c818460…

MALICIOUS

PDF

84.8 KB Created: 2021-09-06 00:53:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f2faeb34eaaa9923c04a87c3ca459c7d SHA-1: 6a27048297878c238c4306dae44aca674a9e3c8b SHA-256: 583b21158c8184600212a05f904b02aa6d90c1ec910ff124d3b01df4ffc01781
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external websites, many of which are hosted on domains flagged as disposable or potentially compromised. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or serving further malicious content. The structure suggests a link farm designed to evade simple URL reputation checks by distributing links across many domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ratosatu.com/contents/files/4140719957.pdf In PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3c98c3b5f---34125418623.pdfIn PDF document text
    • http://zuche0551.com/upload/file/31629218135.pdfIn PDF document text
    • https://arzhosting.com/calisma2/files/uploads/pewinakidolekiwilone.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/72898777550.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608673dea03fd---wozutejakureke.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/16273811954.pdfIn PDF document text
    • http://aifamilyreunion.com/clients/59202/File/makezuferotasizenujoreru.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adac6077837---kugazedek.pdfIn PDF document text
    • http://be1971.com/clients/a/a1/a19be2fc4cf8b198b52f296748481ce5/File/3493469108.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/69291311636.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/5f0edae5fecb8635de56dd7e7f2eef01/69655351861.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//tibuwuwolomujatemivu.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/bopumubiwemiriziki.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3196120773---1023606582.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613116129de4e---gopekikukaligufizazukuzi.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079471c12a5d---riruwo.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/padolepekapomaligizo.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/l8q7i99p2sheemk1utit0slba5/53511279544.pdfIn PDF document text
    • https://longhoang.vn/upload/files/5083643176.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/21740996087.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/538hpbao7t58iabisj7q5is4b5/zikikimasovaji.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/5c19339dfeb49e925e55904eac636288/guraluredezevil.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b80b7a98a4---79918905300.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/3a0f4fe3f1b3fb573a39a54c6a63e212/vozogowet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=soundcraft+signature+22+mtk+manual+pdfPDF 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_off0000dd1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1F 19924 bytes
SHA-256: 01d8ea5510f794b8e61c8ce44781993adc60ea3f924ade3c9003a745215ad9fd
font_01_sfnt_off000110bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D3 11348 bytes
SHA-256: 647530162948d972cf052a9296e653d85b389f4b8da9c98f2446033815f5ec42