Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8fcd0a30844e861…

MALICIOUS

PDF

86.6 KB Created: 2021-09-08 11:45:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2097d47a80cc3233f1c6855745cee6d6 SHA-1: 4c03779aeb5c765a4aecb9a6619ed42aba9bfa03 SHA-256: f8fcd0a30844e861f10c1a55f7e4074ceb5ef4aa8e9023042ffe534c4a1410f3
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload storage locations. The PDF's structure and embedded links suggest it is part of a phishing campaign or a distribution vector for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/ae998ced68676edd533132fea658f1b5/21580283919.pdf In PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4c37293be---sufop.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16093808390e8d---maridazigotewararox.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wenimoxumavanapiwotenat.pdfIn PDF document text
    • https://toocapen.com/files/pobawurifulatutadi.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebf7e1b3c0---81516712882.pdfIn PDF document text
    • https://www.carrentchiengmai.com/files/gumekoneganal.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/65519216826.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/jutonobususadifigul.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/296bc8641fee200fb9383a385ccc9d52/27817124119.pdfIn PDF document text
    • http://hkacca.com/userfiles/seminovew.pdfIn PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/lalejujigifizevo.pdfIn PDF document text
    • http://zamgph.com/uploads/file/021407255011.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16086bd1dc105f---25602487774.pdfIn PDF document text
    • http://irinka.org/ckfinder/userfiles/files/levozapuver.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/e13ea909314413184cb5e8b766dc73a4/xazenan.pdfIn PDF document text
    • https://mimpiindah168.com/contents/files/91839722458.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/f3b1769f5ad08253ec87a17b8333e512/peporabunitakuzotoxe.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090297e495cd---dizone.pdfIn PDF document text
    • http://freeski.hu/freeski/file/82758605610.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/c6f01889278d129ff3893cbd025b4997/divuparipefakurotigularav.pdfIn PDF document text
    • http://hondatayho.top/img-ngocbao/files/61866012220.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/1345938797.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=database+queries+in+sql+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_off0000ee41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE41 17776 bytes
SHA-256: b9163b1d7f1f2d0e5bb95174eea49e2ac3558e14dc152acddc714e7ff530d62b
font_01_sfnt_off00011c9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B3 10756 bytes
SHA-256: 915d870f40203e20f7e45f67301d8fea29d388ffb20b38755c4973c2ac7829c6

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