Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4654b8ae1405b83…

MALICIOUS

PDF

87.9 KB Created: 2021-09-06 03:17:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d78f2e446755a147f6c861704b68d4e2 SHA-1: 73b48a56b31cc2dacb734adcd7d362bfed52a691 SHA-256: a4654b8ae1405b83d08c262137627eb923f888b5d9f96df1a6131e42bad011d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's part of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://mothertheresapublicschool.com/userfiles/file/fobepuz.pdf In PDF document text
    • http://fuku-zou.com/userfiles/file/50702446206.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/85914320121.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/nabadedufuzarawadokoz.pdfIn PDF document text
    • http://tayles.com/uploaded/24243918211.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/nawawaxewuratuzojuda.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/21159416482.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16077bc198464a---fakorosujokorulofufile.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c06f39f996---sekukumepafes.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/c775850fcd23c1aa0cea7de48a6e453a/66728919894.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/83579783161.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/059064b4d1ca6e72d99e650adac43643/bekoletogipum.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/b12ce1618c2aee5516e8fb85a7ead1ac/39705883775.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/737303675.pdfIn PDF document text
    • http://amdind.com/userfiles/file/rulodedikufizin.pdfIn PDF document text
    • https://www.bosingels.nl/ckfinder/userfiles/files/42833089180.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/zutada.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/mazamimo.pdfIn PDF document text
    • https://wagaskar.com/media/mamidifujivavebezaz.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021071321315968.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/degaf.pdfIn PDF document text
    • https://naveenent.com/administrator/imagetemp/file/72199676936.pdfIn PDF document text
    • http://rafaelokazakov.com/file/85427028121.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=types+of+family+relationship+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_off0000f0de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F0 18336 bytes
SHA-256: c126d3dce42b9b7ec07be8b0105301982cc3d6fdabe7e47ac5a12aea953b0480
font_02_sfnt_off000138fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138FD 10840 bytes
SHA-256: d485545bc2c123caea0d2d11814c11328d5ef731792fd8dc645ebecaa65a0c36

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