Malicious PDF — malware analysis report

Static analysis result for SHA-256 52c256a3dad56d07…

MALICIOUS

PDF

69.6 KB Created: 2021-10-03 21:43:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 172506040a86c003dab2f452f8bfeef3 SHA-1: 97e36f9eeb5d04d696264aa55e4d56d5a85c27ea SHA-256: 52c256a3dad56d07c212efec0e1132bda05ea8c48e3691045349b8c7c9aa0504
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://pistant.ru/uplcv?utm_term=before+sunrise+1995+watch+online PDF link annotation
    • http://slipa.site/0429/upload/files/13723131174.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/77393663046.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/85696359833.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/1899496224.pdfIn PDF document text
    • http://phanvienphianam.com/uploads/userfiles/file/158227352.pdfIn PDF document text
    • http://thuaphatlailongthanh.vn/upload/contentFile/minhchau/file/76689240192.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23788085418.pdfIn PDF document text
    • https://mrdak.cc/uploadfile/files/28410870209.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/seeb0vum534iqgflj66r43lv24/jotakifogarexiguzefepotuj.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/942bqn7as7akkf8de608s97qo1/zurugaxexil.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/betujuvidewog.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1615437ea24ed0---nelolo.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/zopipejedokutexuxadi.pdfIn PDF document text
    • http://nincity.de/inline/file/fajolowaxumiz.pdfIn PDF document text
    • https://giaiphapthietke.vn/media/file/files/69016395991.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/zibokixajorukujeve.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/2557001076.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/13296855380.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/teruwekapo.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/vikidavajironamido.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/mivetexepekedutelis.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210913_162707.pdfIn PDF document text
    • https://waelfawzy.com/userfiles/file/In PDF document text
    • http://savvyais.com/userfiles/file/libilijojugojiseviwekup.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/minar.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_off0000afcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFCD 11028 bytes
SHA-256: 8647825b0a11d44557ea708637fa5410c22f979e69584018c6720de63efdbd42
font_01_sfnt_off0000c998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC998 15308 bytes
SHA-256: ada1439f2f3ad145b0c073b3e47357a216cfc2be811bc20135c2a596a7c64ba7
font_02_sfnt_off0000f07d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1