Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fcdc3da7a00da61…

MALICIOUS

PDF

245.3 KB Created: 2021-07-03 06:41:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ab77788bcba8f1ff0a939d99544348da SHA-1: de97c2924590afbc2521e1a4fdf7973a2bba1679 SHA-256: 8fcdc3da7a00da6156db226749a4662a442eeb1ea405241cd74ec7248c00a09f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, likely intended to host malicious files. ClamAV and ML heuristics flagged this PDF as malicious, specifically as a phishing trojan. The presence of multiple external URIs and a high ML score indicate a strong likelihood of malicious intent, possibly to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 5

  • 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.
  • 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://hyundaia.ru/userfiles/file/13261854110.pdf In PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/nugamurozolosijetafuwos.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/tisolofexudapevu.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/d3a2a42cbb916767deb236e9df43e750/durafurububeruzofilemos.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073129c3e3ba---3284425158.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/c45b8ae98595e21132645905fe35f723/20640552272.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/726d6f68811b04545f287560f14972a6/11786114226.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/78042213288.pdfIn PDF document text
    • http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dabuwixumax.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/678a9f284425ab9d127614f336d27220/titubesurofujijexi.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/745ddf7de28a4702f679e2a03f55560f/94029280744.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-7/20210507050453879475.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160853a5d52806---jikujipifuk.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/xelojazonarokipalut.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/76158715661.pdfIn PDF document text
    • http://d4sontario.ca/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/wikakatezoxoj.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160812ddfe45e7---vavukorolaviwiwifuramuzow.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160731e846193f---laxejimomakuji.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b44fd50b7a0---bunijituzebowuxokaz.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160781134bbe39---80229367975.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/30865586366.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/zunekagem.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/24krd3g0rtejs6eihvh1tm1va3/95516527917.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=solution+manual+griffiths+electrodynamicsPDF 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_off0003604a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3604A 19524 bytes
SHA-256: 710e9901d3b75146f9173aff127941205777e860e24ab44cd43896ef9485624e
font_01_sfnt_off00039511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x39511 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0003ad28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3AD28 11212 bytes
SHA-256: 10cdd91eaef7ae7d8ea33210443f77cea23260817a536a7cb7390e853c83203e