Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff6349485849b67c…

MALICIOUS

PDF

79.8 KB Created: 2021-09-03 00:08:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0d3f9e88fdc3b8834f37c2bb59bd4244 SHA-1: 4b18ab760c6eb53c02d96a5ae54d4ad7b190409c SHA-256: ff6349485849b67cc3e67d3d6e07218c929454113ddb628d982ddc782df20833
176 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs that form a link farm, with several pointing to compromised WordPress upload directories or disposable hosting. These links are likely intended to redirect users to phishing sites or download further malicious content, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://epicridesnepal.com/files/safijitewawitutuzadiniwu.pdf In PDF document text
    • http://sjar-tech.com/uploadfile/file///2021080521532077.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/bamakoxitidibefidabisa.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/1c2269b41f953b799661a26ca3cc8fc3/63945424441.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/12239665033.pdfIn PDF document text
    • https://abeess.com/userfiles/file/dogawejo.pdfIn PDF document text
    • http://telmeed.com/web/ckfinder/userfiles/files/31241200967.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/ruwupixap.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c8750352d62---solezovekalatigukave.pdfIn PDF document text
    • https://smallislandcurry.com/wp-content/plugins/super-forms/uploads/php/files/2fabeb2a235abdac5ba21c577052188a/muxamaresuw.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf43f7e70e---23911647637.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/sevewixiw.pdfIn PDF document text
    • http://techbis.pl/files/file/79791622286.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5ea540d07---dafedenokowadive.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6577c8c51---70343691429.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/18023964209.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16099806d98aab---63049523439.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/b17ed6055d5e39ca57615e210c97c67a/57979443753.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/a59a1e0b09f6e9027cd871d9940a19d0/98980741085.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/2569363527.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=12+irrational+beliefs+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_off0000d3cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CD 17388 bytes
SHA-256: 30f3a567a54908a1b5c2db7236a1284973a80ccabc15c9bde40965b159b5958b
font_01_sfnt_off00010134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10134 10704 bytes
SHA-256: 32d0b63c5fe0da9cbbd1e13c3986cfa094574392abafd7aa35e4c6043940afb6
font_02_sfnt_off000119b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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