Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ae65508718200f5…

MALICIOUS

PDF

76.8 KB Created: 2021-09-03 03:53:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3ef0835e2da03226b12ed532ded7c44f SHA-1: a9224e29b51fb87cdd58ed6cb759660f9eae10f9 SHA-256: 9ae65508718200f53c122be1642811f8c19ee15e10899d97ac995f04f43ec2ee
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous URLs, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to obscure the ultimate destination and potentially deliver further malware. The PDF structure itself is also noted for having duplicate object bodies, which can be used for obfuscation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/o2cc71g5mhrlklhdsrbkgn54qc/1673240222.pdf In PDF document text
    • http://tuderprogettazione.it/userfiles/files/miseninemitud.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/kikekezifamu.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ad04e9245ef---lifek.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/gifod.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/gdagqo3squvadkgh8fs9dmd173/bopeli.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/15436643664.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/pelilevirituwoxazot.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/43993365639.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/3ee65436b57c9a6178d9744717fbac72/netuwafik.pdfIn PDF document text
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/xazumiloropigazasibogujo.pdfIn PDF document text
    • https://somogyplusz.hu/files/waligamuwi.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/42874040878.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f951481d2fe---favogunonun.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/4981046896.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/sikozoka.pdfIn PDF document text
    • http://armanetti.com/images/zowaneno.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/ipcgbot1nspumk2eq3psov3ku5/90038516116.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/9s6a9ka4h5ge1ejv365bi9k0g8/xidofovepegelotetimowij.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fcf60c35fa---35135216960.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/74092741548.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/1992435631.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/73295869539.pdfIn PDF document text
    • http://c-amc.com/upload/files/boparaxikokowerube.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/9037545898.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/h9h2a07j6ika6hrve7gl5be96n/fonikiditafevoxigoxi.pdfIn PDF document text
    • https://e-midas.ro/files/file/78810904828.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838ff20724a---30175935915.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=gravity+sanitary+sewer+design+and+construction+pdfPDF 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_off0000c6f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F4 16724 bytes
SHA-256: 6d5177d2a0bb726e0111f0c6c02f5a8cb99a59738cf555555764fdc446e7b98d
font_01_sfnt_off0000f276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF276 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8D 11156 bytes
SHA-256: 375d2ab1c1d5d2273f3cd25acbfcaa90867cca43c69037c620b3a54b188b9a2a