Malicious PDF — malware analysis report

Static analysis result for SHA-256 9eb10a771efb4d6b…

MALICIOUS

PDF

80.9 KB Created: 2021-09-02 02:18:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bd9d87894e5e3604783ccc521dddfa3a SHA-1: 8812e4c649748665261d514a0df17ea4a85e875f SHA-256: 9eb10a771efb4d6bc6432116cbccfc671406e8522144280aeda29f9046cfa5f3
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights the nature of these links, suggesting they are used for SEO manipulation or to distribute malicious content. The presence of multiple external URIs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://pixomot.ru/uplcv?utm_term=be+fluent+russian PDF link annotation
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/rdv7rf1f4ogmev5oopj8j4vpup/58143581717.pdfIn PDF document text
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/loxuvojike.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/27932675406.pdfIn PDF document text
    • http://toonesk.com/upload/51575226605.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/bekavovimus.pdfIn PDF document text
    • https://conrays.ru/f/data/51249275245.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa984e6531---rapobogek.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/jurawumowivek.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/qqpast45uucbmdnqs93msq7tb3/ketezuf.pdfIn PDF document text
    • https://subarini.ro/mm/file/20417152382.pdfIn PDF document text
    • https://actorconseil.com/files/file/65507204527.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1610b692520920---gogevizilexugalogi.pdfIn PDF document text
    • https://unosms.us/userfiles/file/topexuruxu.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/56608964543.pdfIn PDF document text
    • http://7tec.ru/userfiles/files/28514421155.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/bozewibijitobute.pdfIn PDF document text
    • http://ave-france.com/pics/files/67681820008.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/30751375915.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e9784e1ea30---1248484271.pdfIn PDF document text
    • https://okazionche.com/files/mukixoxotorororulixim.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161147163dff71---363370620.pdfIn PDF document text
    • http://kaies.net/upfiles/210902061821472620pva5b8.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/99203846522.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb6610780c---nomutelomawaki.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/072d070e0537338969de6b1971b96ccf/pujuga.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/e59edd938e8ce87da1c0bd9eefc9fa65/44553686273.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_off0000d69c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69C 17836 bytes
SHA-256: 64cb28edbc7e60d33dfee1e035e6e7b1babafb823e4d7312f831febe48a6a8fb
font_01_sfnt_off0001052c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D43 10240 bytes
SHA-256: 0d58df8ade0fc02d2e68748176393827c76ad6d0ceb331b910635d637e4129fe

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