Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fccc31d95cecd27…

MALICIOUS

PDF

90.5 KB Created: 2021-06-27 02:59:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c6173f7530fe9d4e89a9c2fe78e9961e SHA-1: 30de7c353c07c9fd91b475279307d5387a5d1d73 SHA-256: 3fccc31d95cecd27ad6883621a914a24cdfc50eccd6862bc25aa911fc3294fee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous embedded URLs that form a link farm, with many pointing to compromised WordPress sites. These links likely serve as redirects to phishing pages or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://coretry.ru/uplcv?utm_term=stacked+or+unstacked+uninsured+motorist PDF link annotation
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/d73d72a32055a82ed02bb3a2fb570078/jumiborurifunuviwob.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/21ed39460ce41c7854b383f6434cae52/ketisujavuvo.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/momilike.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/98917317634.pdfIn PDF document text
    • https://airbays.com/userfiles/file/99727527855.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/e63a0dace225c138b788b33e9857a4a7/99716705632.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/zapukuzinogedunisete.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aad2be7e70a---negen.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/8e4a66fb981684b31fba4fafcfc1c06c/xebawujiwakiwipu.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2144700cbd---sebixojoligagidijefobi.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/be6245580682696842d897cc17096be8/59253797173.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/3e9339b1237f88455596a52b943f0e51/12903953573.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae7e40b564---9752458683.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3426738180---10250793265.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872ffa02703---79523971171.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/8pn8avmqfr4a1nm2970a3ipoj6/21051341324.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/lovebipuzewimatalimatopiz.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/tuvojepadakumogug.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/3513134971.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/9b7c3119d8a48571dc3c2113eff9fcfb/tabidu.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f16430db43---60832189433.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/cb30501a53c602e8ff90d2f39f146b4f/muragusezibabev.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/7aa8e3abefba3dea803dbda5379194d0/xinefanutabe.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4c1b01238---40496896084.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210611230924.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_off0000fe27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE27 10752 bytes
SHA-256: dd1a92f34490e28bb252e7b1e69d65f97032d5777b0a22e192c62155cb4a2dc7
font_01_sfnt_off000116e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF6 16848 bytes
SHA-256: 38cc965c2b01009d0f64571e5a45fe0fea38679758f75f58bf8512afc356152a