Malicious PDF — malware analysis report

Static analysis result for SHA-256 753a1a0f894618ed…

MALICIOUS

PDF

84.3 KB Created: 2021-09-12 09:49:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: aa93b44ba1f307a5190c4251a9e6bb4e SHA-1: eb1bd11f586799cce0e6e66bba656495b00d8e75 SHA-256: 753a1a0f894618ed03d86b9c96e28d63beeae1d71ddc5c909ddcdc5fea9d28e7
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to compromised websites or disposable hosting, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and link farm behavior are consistent with techniques used to distribute malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://apexibd.com/uploads/fck_uploads/file/33868959369.pdf In PDF document text
    • https://coop-alternatives.fr/images/images/632845303.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/wuvofikumezepitasimixubo.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/30a5fecaefa1ceb03e861c8e507fedea/foxisudelupugurox.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/mazibu.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/luvivoxe.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/pegedabofedekemiviwofi.pdfIn PDF document text
    • https://idosekotthonaveresegyhaz.hu/files/files/36850694368.pdfIn PDF document text
    • https://8foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/54929492698.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021090120554473499.pdfIn PDF document text
    • http://tsuiteru66.com/userfiles/file/baxasa.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16135caac40d1c---37689596201.pdfIn PDF document text
    • http://lecostationery.com/files/file/jaxuwovisasemin.pdfIn PDF document text
    • http://jaluzipro.ru/public/userfiles/file/46343933727.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/32326738137.pdfIn PDF document text
    • http://szigmetal.hu/editor_up/xelotarin.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613809fc3d44a---biregus.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/balasenozinon.pdfIn PDF document text
    • https://srilangkapools.com/contents/files/38232842991.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/simidelena.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136af8a934af---nusijinumobajebenetabok.pdfIn PDF document text
    • http://checopharma.com/upload/files/90405036952.pdfIn PDF document text
    • http://yksskj.com/ckfinder/userfiles/files/forogorekodonefusaresoxa.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613683235e37a---pakekepi.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/90705429351.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/mijipijapupevikomagafe.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/kudogogixidinu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=percy+jackson+and+the+lightning+thief+free+ebookPDF 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_off0000e424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE424 17352 bytes
SHA-256: 82d3b4f5fded805eaad7404ef34debf440bd2dc6dab3f4998cc08714f0985159
font_01_sfnt_off00011061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11061 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12878 11232 bytes
SHA-256: 9eb2255c33a6cb7f7b4156511e9eb0905e1190dcaae261ddd675ff55a582e8d5