Malicious PDF — malware analysis report

Static analysis result for SHA-256 704b64eed88b5e18…

MALICIOUS

PDF

73.5 KB Created: 2021-10-02 20:47:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 5d56a6b9b59ced63be3ae1536500837f SHA-1: 03ea0b4d2dc561c449fc42671182fbed608c4488 SHA-256: 704b64eed88b5e1852de5ce3eae1099e24cda670dd41c4e49b2a561d97b81d7d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous external URIs and is identified as a link farm, with many links pointing to compromised WordPress upload storage and disposable hosting. The presence of external URIs suggests an attempt to redirect the user to malicious websites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://archism.ru/uplcv?utm_term=enzymology+by+price+and+stevens+pdf PDF link annotation
    • http://evergladesharvesting.com/ckfinder/userfiles/files/babenenizixufujeredimo.pdfIn PDF document text
    • https://aashianarealty.com/file/78787971875.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/47752081216.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/32353839789.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/99974700712.pdfIn PDF document text
    • https://classykitchen.pl/web/uploads/files/60811622580.pdfIn PDF document text
    • http://hamishehbaharcarpet.com/My_Project/Hamishe_bahar/ahar_img/files/fedonazebeku.pdfIn PDF document text
    • http://twatpchome.touchance.com/userfiles/file/zakovudiwuzolofuriwal.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/funujofakusotevajeladebof.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/gimafanukifelumukilir.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e162d92bbf---89019828360.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/64662910883.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/46415393830.pdfIn PDF document text
    • https://haisanquangninh.org/data/dulieu/files/29394495245.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161327d8d5d8dd---14752538375.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/77857633405.pdfIn PDF document text
    • https://maintogelonline2.org/contents/files/47878467606.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615593232680d---nepuxazimewowuvipiw.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/a2c17984f1b7e1d17e7a2e2924bd1751/guwuxamugoj.pdfIn PDF document text
    • http://edituj.cz/res/file/zepimuwimuwezeluripawa.pdfIn PDF document text
    • http://sinching.com/uploadpic/files/202110022355196046.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/93416117702.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/9347999568.pdfIn PDF document text
    • http://worshipedia.mobi/sites/default/files/file/mivanomasefegepa.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_off0000b9d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9D2 11328 bytes
SHA-256: 7e54466649d9479be97ff7a7668d41f70f767d1ad8b3cb6615f54f3954f32a3d
font_01_sfnt_off0000d415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD415 17332 bytes
SHA-256: 5f41b9e4f4f7eb2e7d3162246291956138c3f079a556bcd272275e8118bb16ca
font_02_sfnt_off00010061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10061 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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