Malicious PDF — malware analysis report

Static analysis result for SHA-256 8178325a204b566a…

MALICIOUS

PDF

84.1 KB Created: 2021-09-02 09:06:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ddc94c33a20813dd64127112eb61607c SHA-1: 921d1e24127971540201a2442e2f82fe5e6bdce4 SHA-256: 8178325a204b566abaeb88be22ca8739f88209d0f70af3f3560e5bb29481af48
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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://xn--h1acbpobggs.xn--p1ai/data/files/lalodujezuxobetob.pdf In PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b48d0cbb8---ruselokajezizuvav.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/jisesisogu.pdfIn PDF document text
    • https://charqueadaboavista.com.br/wp-content/plugins/super-forms/uploads/php/files/adae345c742e2f080f817d992e8cf966/53782650281.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/78498941198.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/hqjs664ndbc5kdqpmiomaoc1q2/kodanufagelawosawoz.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/61315917212.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/telamalixusux.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a96dd6be60b---37965853619.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/nuwekibezexupunerajosu.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/46866133387.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/3ca34f0c6e15bc2f85ca7a7338575903/62448141457.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/raduvubimedoxuvijo.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a24dd7f89---jonisi.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160865f935c56f---22168079784.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16075c0f880133---bobovo.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/0d2d719b5c55b329921865d1335b9c35/zufaxuxaniz.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16079117f386e2---40811839485.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/lelutijexesoberuxu.pdfIn PDF document text
    • http://ipublicity.cz/data/file/wulutezugatojofelibogek.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607677b80304d---73861686922.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/11377168035.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/39438293978.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/fa6a613a5b9820c27f3a814d29d3f895/88833796321.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/cdaadd1d21123392a164a98b569b9a2c/gijizepitasudunu.pdfIn PDF document text
    • https://andrejc.si/files/file/jugoguzu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=blood+supply+of+bodyPDF link annotation
    • 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_off0000e4b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B1 17936 bytes
SHA-256: 3f7458a4a0d0b96b5e66daa84f1bf885419137e2a0faaad797852a8a7a5b7e32
font_01_sfnt_off000112e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012afe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AFE 10212 bytes
SHA-256: 4d734f5c14ffcddee781c18b72a2f9cef2e4abe2a5740dabeac451dccab2c4b6