Malicious PDF — malware analysis report

Static analysis result for SHA-256 30ee6f94190be519…

MALICIOUS

PDF

74.4 KB Created: 2021-09-02 10:06:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a2e5f219f96fb2d06bd4f7459fc3e1b8 SHA-1: e380680bdf90b42307baa553db4ec400c9e7c2bb SHA-256: 30ee6f94190be519b5144c1347fac20a73a79015428929c3a7c0feadf11a1fcc
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to potentially compromised WordPress sites. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The document's structure and numerous external links suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3cbba25e2---71254916175.pdf In PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/f7625b1a0794b1c2283fc6e092ca889d/kubonutovan.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/93602170928.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/rifiluzazitutodes.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/69312456637.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/dc784bf658b8451bf5ff1da2271035a5/sijunipisaju.pdfIn PDF document text
    • https://xistenze.com/files/files/fusozafukeg.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/21793501409.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/8416cb87b0215cb3630e387e9e737e3c/47740239318.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/wuvodubovo.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/bipega.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/vulamafapimoz.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/07cd716f006164ac20d2904129ea3057/fivegawizukodosemavan.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/82761407351.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/pezobedivubopuzi.pdfIn PDF document text
    • https://itacademyindia.com/ckfinder/userfiles/files/pefalumijawalekujojama.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/fererivezomu.pdfIn PDF document text
    • http://euromarkcreations.com/new/fck_img/file/mowuzojot.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/kanulopiredalomaxukibubi.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/ae8d257bd23c005e7b7aecb8f87c4d06/wovubek.pdfIn PDF document text
    • http://eco-building.cz/UserFiles/File/22107771513.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/eca608595726d2520ad6bebea7cbed4f/pegadonusejubaxu.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/731c19f49fb41b80ff122e2f9f75da0f/kujowisanuvoveg.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a328c275d7b---dikago.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=into+the+unknown+piano+notes+lettersPDF 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_off0000c1c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1C4 15984 bytes
SHA-256: 4edb28d18526065a56afa2e74e5abdb6b97b8aeb3aed57c1fae48edd865b76e4
font_01_sfnt_off0000eaa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BE 10576 bytes
SHA-256: ce3690fe6cce727bdc97b70a73694ca664a85aa7d585d9641d735f3f7aeb2ce8