Malicious PDF — malware analysis report

Static analysis result for SHA-256 886b06c1b67d7c5b…

MALICIOUS

PDF

86.1 KB Created: 2021-09-06 11:50:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5dfdb382a68b3c1a7592630747cbe195 SHA-1: a6800bb39611d688e884dbf9898f17f5f35b7dbb SHA-256: 886b06c1b67d7c5ba5e8f4ddbff77e64089db458824a4a5b01e85d49c05dfbad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites for further exploitation or phishing. The presence of link farm heuristics further supports the attack pattern of directing users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://www.onlinenieuwsbriefversturen.nl/gebruikers/afbeeldingen/namade.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/0pb411tkv4njqecdm5vulpcbs3/lojafanegafolalex.pdf
    • https://www.bevillelecomte.ovh/ckfinder/userfiles/files/dipinen.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd0657bcdc---32338760844.pdf
    • http://voxel-avocats.fr/uploads/file/ninopexez.pdf
    • http://gld-lining.com/user_img/files/97242445195.pdf
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/mowadowexilibipurofenak.pdf
    • http://jtour.vn/userfiles/file/60754942252.pdf
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612b8c561e682---butesupilutoxuzixukez.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3259c9f46---88846910974.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f76926bdc---bixemugezaxanenarewuteti.pdf
    • http://dichvu12h.net/userfiles/file/dolabikisaz.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8841a553cc---75417614858.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0950d6a5dcf4210b06423355552988d3/48516026983.pdf
    • http://kor-ra.ru/UserFiles/file/wamunusukepefu.pdf
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/5f41edb560c82cdc03d2ecf89ff42b8d/44889192317.pdf
    • https://hanahana.vn/media/ftp/file/37869733544.pdf
    • http://staples1981.com/clients/b/ba/ba027a536d51c1d997ee76cae6dc9017/File/28621491513.pdf
    • http://greece-ex.com/images/blog//file/somoxujasebudevewukafoj.pdf
    • http://sh-ruiyangcpa.com/userfiles/file/2021-7///2021751125291283.pdf
    • http://kapli74.ru/upload_picture/zifofifutuxesaw.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da17489d84---59058943260.pdf
    • https://baptistfriends.org/media/29812429026.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=dermatitis+solaris+adalah+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebb7.bin
2e9ef7a768e5d5bac53e9fc0ea2d4ddc09b784c990ae66d727dca0aa39a8f061
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB7 18240 bytes
font_01_sfnt_off00011a8c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8C 16792 bytes
font_02_sfnt_off000132a3.bin
bf2faa25eefa0eef35215061f46eb2746aca54e1d79ca3dfb2ba4474d739d74b
pdf-font-stream PDF embedded font (sfnt) at offset 0x132A3 10660 bytes