Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbb6f524763af7d9…

MALICIOUS

PDF

87.3 KB Created: 2021-07-07 16:02:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c36aa78bb3bc40e03279bade6f6b7393 SHA-1: 409612415ee79c896c8f441d9c1f33f330564416 SHA-256: cbb6f524763af7d9e8728177873765394e745701708ffd633a1eccf946cc5971
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL heuristics and malware detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nothingbutsafetyglasses.com/userfiles/file/zuvokutujufegazilofud.pdf In PDF document text
    • http://zonazero.es/userfiles/file/85987685817.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/80381753221.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///vixapumi.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/91959840839.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/46977301259.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609670ebbc71c---36148343434.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/ba007de5b26458d5c70c1b73640cf53b/72545749141.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/1c5e0579a8939a1e8a5dc2804f3a9b2e/lixame.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/hieu7e6ses349tcjcpoem68lq5/17280530529.pdfIn PDF document text
    • http://meechoktoolmart.com/user_img/files/18277321841.pdfIn PDF document text
    • https://people11people.gr/uploads/File/gajoguputefozenatipelata.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f6c9db340---waregovofawuxipi.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/78985646702.pdfIn PDF document text
    • http://alexandraharris.com/clients/36054/File/62906245992.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/5eb28c47cf1c9bdaa7f299cb8ab246a4/95646769759.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/13135815533.pdfIn PDF document text
    • http://lacyfamilyunity.com/clients/2/20/203fd950dafdada58ea32e7b96f0d147/File/42008836009.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b6c3aeaa6---29128025859.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb954eb3ca---mimixup.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/63124248727.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/73252956188.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/jexanogupezuwegekolizaw.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0b544258c---juwozokodurimeditekun.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/13442560634.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=the+span+of+control+for+a+managerPDF 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_off0000f3f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F6 16536 bytes
SHA-256: 499d35293cf178875ec70829667a427455ef034ac61f5d2181cc3c71a570f38b
font_01_sfnt_off00011ef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF3 10796 bytes
SHA-256: 25f2c5327156bb27e1dee92f488bbe70ed3f4c1a492525034ac585b7d656b3aa
font_02_sfnt_off000137b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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