Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bf074114db64ce0…

MALICIOUS

PDF

75.7 KB Created: 2021-09-06 02:58:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b435dfbc5dc988125b9f0b99ee5cf8ed SHA-1: 6b39d7838a8c0a26a9ea53ed1946f47cef2c5c7b SHA-256: 3bf074114db64ce0abc628cf8e1a1c29e0a6bd008fbeecc165c1e28adc9a921d
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. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. The embedded URLs suggest a spearphishing attachment vector, aiming to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://inwebjor.ru/uplcv?utm_term=cambridge+math+grade+6+pdf PDF link annotation
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16089321e78281---23830048762.pdfIn PDF document text
    • https://negaratoto.com/contents/files/32975528808.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/62806736274.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/d6ca3bb2f82c75bda17593aad614a072/kuwevewejokuf.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/266fca49198efbad85907aa9165f5795/21590669606.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113137473052---35185635158.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/e5c492eb290fb52a304dae25cec7e954/38620249968.pdfIn PDF document text
    • https://coil.hk/upload/files/begitilaturiroxarivoxup.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/86857maei2ja5unidjg9ijmtn6/35644826369.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074fa3515450---17666408160.pdfIn PDF document text
    • http://soundreaming.org/wp-content/plugins/super-forms/uploads/php/files/6fe7f2a1ab8216279071a8f3b3f68fd2/16311882870.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/xipolanuzupulovazila.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/togevugixedu.pdfIn PDF document text
    • http://thefarmatarapahoecounty.com/userimages/23621981343.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160f0ecff21f09---61082579585.pdfIn PDF document text
    • http://www.vnos.vn/app/webroot/uploads/files/lorexawevav.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160ee2059adbc2---373621873.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/7776f8653f796d5ac1a8d0c63f7b4075/59412193290.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071779dd19c7---jefawizilegidevodebiw.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/41661179463.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/0baad994e5facfd8700eee1bcf0a9c3b/xokok.pdfIn PDF document text
    • http://hamkr.com/userData/board/file/mufeserububowagev.pdfIn PDF document text
    • http://mega.kz/media/upload/files/73243756074.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/60770569080.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/kivezerufonu.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086fe6a7a849---59730884039.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_off0000c232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC232 10848 bytes
SHA-256: a363f224deb2d11b522c584be44afe7e3b55926f54ceaf93fc2974670232c879
font_01_sfnt_off0000dad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD0 18356 bytes
SHA-256: a6696a5bb5d77688dcfbcdff43e79d72a378f28b64e4e41c4bd5e20d60e7d172
font_02_sfnt_off0001091c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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