Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bf0dc086cdefdd9…

MALICIOUS

PDF

94.4 KB Created: 2021-06-27 22:19:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 866f44ad11a2c9d16cc0ee65ba558331 SHA-1: a217c9c19f9eb8acbe3a79f778b6f300cce8b79f SHA-256: 1bf0dc086cdefdd9dc759d0b49203fdba923c8a3b622f14840fdc888464f1cc2
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous distinct hosts, many of which are hosted on compromised WordPress sites or disposable domains. The primary purpose appears to be directing users to potentially malicious external websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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=what+place+does+religion+have+in+making+ethical+decisions
    • http://kovacsoltvaskerites.hu/images/file/pilaze.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094368236ecb---67342378097.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073364c60f23---tumanemepugese.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160895cbd0dab4---83607902204.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a4e453d56---pamizurunus.pdf
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/7ae8e6e20da0e89876791bacb17ccb46/91001358456.pdf
    • https://next-engineering.com/userfiles/files/guviz.pdf
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/f5d9d319e310b4d7ceae955ee64d2e1d/55129285269.pdf
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/ae0d1c40c1f9d0744a7f004e5685ccd4/fabapuvu.pdf
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/u3j09mjpj3k219nfhkfjdkb90n/6972463812.pdf
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/3552eb8cacd8fba26f52ae85123fdc86/26096613500.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/fkk3qk5jih0nl7bovvh8t64em7/wavetilotaviwovot.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/mliqra3vroq36h4jp1m2vco69u/xigopisamugokanefovo.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/6ea9eba2a99294856b2ca51b2bc55722/nivamasulavad.pdf
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/272cf92cfea1906aeb57178d24dd50a6/64827522742.pdf
    • http://dh-cell.com/ckfinder/userfiles/files/sebov.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070156ea4e88---xometizagux.pdf
    • http://ags-sib.ru/ckfinder/userfiles/files/xaxawexafitowujikojolalod.pdf
    • https://ivanda-commerce.hr/userfiles/file/80888162574.pdf
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/1e2de7cebedf0475857db4454955ec68/98387555311.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b6019fb21---85186479868.pdf
    • http://kfbi.ru/content/file/punosak.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/1nf38ckcslm0idi4882cvhoas5/bulomitekezabok.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/dhjgj2tp74hb2ih6pe9fr91dft/mijinujejupuwarubulupu.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084077088399---55833411878.pdf
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/378095d2cf1611a53a6dd10d7a68fbb0/wexemorokinelofamapebi.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_off00010e6f.bin
1be26259c8cd975ff78838bd5a22a656da8697a15ea8e1ffb2926f815e39f1a7
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6F 11112 bytes
font_01_sfnt_off00012802.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12802 16792 bytes
font_02_sfnt_off00014014.bin
90e484d896c956fd6ff623c3fda2a89194bde587abc74b42788f26a8d814e88f
pdf-font-stream PDF embedded font (sfnt) at offset 0x14014 16752 bytes