Malicious PDF — malware analysis report

Static analysis result for SHA-256 0804b555374149c0…

MALICIOUS

PDF

89.5 KB Created: 2021-08-08 19:08:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: aded907c1c47106a144b8eebbc9a2ab7 SHA-1: f2361efcb49386310b50c1ced0ee1c708fb97db1 SHA-256: 0804b555374149c0e3460bc3fa81fbb39bc1f96a4aba014eaed3f3da9731e2ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites. The primary purpose seems to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://philabc.ru/uplcv?utm_term=formato+hoja+de+vida+funcion+publica+editable+2019 PDF link annotation
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e864fec5d1---19546389433.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160acb58bb897a---64339303961.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/vamurolax.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/dobisumozetomizeb.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/21613632657.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c601486f73b---sajadejisugelepologiwom.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1606e83101e207---58618248062.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d9b6a022c---80950115297.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1ee48cdaf---57286969989.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/9764867296.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3b1f703f0---77558535384.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/buwidedoxajimor.pdfIn PDF document text
    • http://whewfamily.com/clients/12004/File/mizurenivifil.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/e3c31b463839bff9657fff6727fa2552/54851158527.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/lifikeberusinazaten.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/75638080528.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/joxani.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/50692034981.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/ca59af5fbbff56fe8b73c441eaebf58b/bibumukitixopufusakubul.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/9212398764.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/76544990760.pdfIn PDF document text
    • http://cherishedmomentphotos.com/clients/8/84/84fe84b553acfcd191e166b7401b6f02/File/92223442611.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/79ft9os52svhce27rbh2rj3mi5/52599403416.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16090f36f3126d---53330340823.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/tiv23ot42glg1sf0a0ks4r1ftd/pemedaroruwapawar.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_off0000f13c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13C 19072 bytes
SHA-256: ca8a55c5f7f0a55a23e24dba2706973b88e03dd561a35a3b07b591c69a633c4e
font_01_sfnt_off00012180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12180 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13997 11592 bytes
SHA-256: 9bac6f7499bf2b50608cdf09dbd81da6a5e201de7ae23396fd154945d06b5106

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