Malicious PDF — malware analysis report

Static analysis result for SHA-256 694ff779db8addd5…

MALICIOUS

PDF

84.0 KB Created: 2021-09-04 13:15:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 5c9f0315db7a0cac7f1a96eabbc60c94 SHA-1: 8001705c1b89fbd82bf440484ee98d0854207bac SHA-256: 694ff779db8addd5b8fb4c5422f3e1f97a2f49cbc7ffaf7f33929b5b667804b2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest the document is part of a link farm designed to host malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coretry.ru/uplcv?utm_term=cardiac+arrest+pdf+usu PDF link annotation
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c05b275b44e---8131884264.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0c35174c9---xevorapimogubijij.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/37291427668.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/28b68ec87b17498815c534a3b942382d/54869690018.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a62b5863c---22371598987.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/15349608321.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/69fc05fefbd660288b451b9bc78acb08/79276554619.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021052821512116.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16090b7e687481---gezavidivulibabevig.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/bb3d5edc659e1db13c4282bd3cdd9523/40725566434.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c08f4213fc---25580620032.pdfIn PDF document text
    • http://griswoldremgmt.com/uploads/files/kixikemijepudenupe.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/74pakh7nh1c16gfki92ekg2beq/69661008372.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb5910c797---midutinanozupizagadenesif.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name//files/19765293172.pdfIn PDF document text
    • http://sooam.com/files/fckeditor/file/313400071611cf8a3e4539.pdfIn PDF document text
    • http://k9careclinic.in/ckeditor/ckfinder/userfiles/files/rinexutoxaxupiranaz.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/b1cbeab052523022cbc860468079ac4c/91647779005.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/15500274497.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/87445210990.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/2f54d5f02251dfc1cfee7bc68a402255/85742780610.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16077d4bb6cef4---milikizaxitepakaboxaxabig.pdfIn PDF document text
    • http://brooklynsmokeshops.com/admin/images/file/bosuxodisa.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/dikomafijilojeluresipir.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/duwojalerokikuvir.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_off0000e509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE509 10476 bytes
SHA-256: 57299cfba6998ecaf114ee00d390a2910145e8818e1142280d1218a758258ba5
font_01_sfnt_off0000fcfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001150e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1150E 17716 bytes
SHA-256: 78a6ca9255f2a0586c5228cb993ec7146786e42dfe8d71e3819ad0ed042354c9