Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbb8d9c6d3805329…

MALICIOUS

PDF

103.0 KB Created: 2021-08-03 12:27:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 922a0ffe81d3ef59465da77ad7a91c47 SHA-1: c47e99c93b96d5e8f315c2f739b9ad522e9c5995 SHA-256: bbb8d9c6d3805329a590e040190004830b783bb4a719073aebf5d44f3e079a64
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm for phishing or malware distribution. The presence of external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/eb41d5b7dd44d96a95d19ca76a10e675/zerowozaloragogike.pdf In PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/uv8nruokllv4k26fh8i0gfjpmv/zurovevirotuvekuganader.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/10ae827c9db5cffc0ca10b2202751e42/wapajimepavi.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/d2f2283daa1ee9ca18b96fb9380a3e25/liziketunewido.pdfIn PDF document text
    • http://childhood-matters.com/clients/49507/File/bimudip.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/zarerivog.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/jumujesesuvawawujutuva.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/46623611282.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/faderaxunevukefisuteja.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af6d519981---19928998039.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/d7a4c32b890be43d55deff1f9f9ee478/71986586898.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/vobefaliv.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609b53285c6dc---wasojija.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/82a9a0723286d11f2508f019a71058c4/nilekedarafunikoporori.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/worolos.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/puzumixulubilelaz.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d04988a36c0---rimojukimixamorobaz.pdfIn PDF document text
    • https://ahha.az/userfiles/file/sanitigagogebakexabemi.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0273a6fd9---39643001355.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/21924100331.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/poluwixetekonekulixo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=acte+3+scene+5+mariage+de+figaro+textePDF 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_off0001272b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1272B 20200 bytes
SHA-256: fa3571c71b2a502e8e92b145d73c4ae043ef6073f3d7eb92b57b4e03f08e23fa
font_01_sfnt_off00015976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15976 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001718d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1718D 11160 bytes
SHA-256: 37058ce4a472e4c8cef28d33f0aa2c6e6571ffd42b42e816b8f1b829b61ce164

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