Malicious PDF — malware analysis report

Static analysis result for SHA-256 85f74ed394d19825…

MALICIOUS

PDF

89.5 KB Created: 2021-09-16 03:02:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 81d0262d48b80771bad540607f133ab7 SHA-1: 8e8162b6fe97f916f2cc6e3e4dba12fce2c6013c SHA-256: 85f74ed394d198251c9fe62be0f50aca30498b19bde479ec6d66f4bee420e6a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to various external URLs, some hosted on compromised CMS platforms. The presence of embedded URLs and the overall structure suggest an attempt to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://garglob.ru/uplcv?utm_term=cruise+ship+tycoon+cheats PDF link annotation
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/3ff0c3096b145d655a2416034148e6fc/varisagenumiresetupedixov.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/jugizuludoraxagopido.pdfIn PDF document text
    • https://yensaovinastar.com/media/files/zisadupakek.pdfIn PDF document text
    • http://packagingandfoodmachinary.com/userfiles/file/46977390190.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/vejirufapeme.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/09e3f08518fd29108cac5eafafd6d57e/5758065691.pdfIn PDF document text
    • http://qdsenfeng.com/data/files/32772129569.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/zalameled.pdfIn PDF document text
    • https://fond.ru/userfiles/file/77324964322.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161309202ea76c---47305273372.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/26088441795.pdfIn PDF document text
    • http://samocvet.org/foto/ck/files/fafelefavagopoweguzuge.pdfIn PDF document text
    • http://lukinserv.hu/file/14411090881.pdfIn PDF document text
    • http://cornaredo.gattinonimondodivacanze.it/themes/userfiles/files/fefurasumesogirojupusel.pdfIn PDF document text
    • http://ellev.fr/upload/files/98959551276.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/tupevi.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/73641495997.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/mesaxiku.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/zugiwe.pdfIn PDF document text
    • http://saga.diamonds/uploads/ckfinder/files/bujitususu.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/161375a9c7136f---wonorewogemikilifuwozenug.pdfIn PDF document text
    • https://dptech.vn/uploads/files/94726686434.pdfIn PDF document text
    • http://nbkhjc.com/uploads/202109/file/210901165347092961z68ulgyrzd1i.pdfIn PDF document text
    • https://makenie.com/upload/files/7610579602.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/9r3s724tj5qfr3sev5dcpd4gi8/91019124431.pdfIn PDF document text
    • https://gullyracing.it/admin/ckfinder/userfiles/files/xosewolevuxitos.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/lajemupopigetefeto.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_off0000fb87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB87 10672 bytes
SHA-256: a7b9770c97659a200f29cce6535e0f612cf3fbc5244da77f849306c89fc49f7a
font_01_sfnt_off00011404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11404 16976 bytes
SHA-256: 3af7a7e8961d5e9d52b77c805c9c98776eb7381e173dbf5c9e281fa68ab0da31
font_02_sfnt_off00013ffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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