Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e2c04b4cba4a7ce…

MALICIOUS

PDF

81.9 KB Created: 2021-09-04 12:48:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0a5082e28463d50df6e103b7d8be1213 SHA-1: dfb617ba04b82786d101a565e06c1ca53c80e1b4 SHA-256: 5e2c04b4cba4a7ceaae98621ed82d2a990edd5ec8c63d583f035655472398a3c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for human readability but rather to host links. The presence of these links indicates an attempt to redirect users to potentially malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed4ba9d2cb---25532471293.pdf In PDF document text
    • http://andrelandberg.com/userfiles/file/53295197954.pdfIn PDF document text
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/70471112686.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9960fc65edabbd5a120d64ae5921adee/55767622387.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/36136260166.pdfIn PDF document text
    • http://faradbox.pl/files/file/84305874565.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/2c2e4f2f0cc1d961754c4b913440dc48/65306739297.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/34fa706f1811db4cd7b98016451d0312/gejuturulatidu.pdfIn PDF document text
    • http://jp-cable.com/d/files/xedarotorusopitifemusek.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bd4e93bdc---jubusipupataburegirujoma.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/14137169653.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9653d2195---rigasuxebonarunovax.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/ecaa4fd85a13ad9adc81491e726e1c5e/19382363845.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/gunaxewujixataf.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613011cfe7824---59365986054.pdfIn PDF document text
    • http://polkovnik.su/upload/file/fikakabujama.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/mubur.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/15a61a6f25a72abef596574bb8315e09/99462817120.pdfIn PDF document text
    • https://33mobility.net/uploads/files/57414715877.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/lituzidunodofipototuj.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/xaforazoxukiduvadesijum.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/2905818347.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=2013+john+deere+gator+xuv+825i+service+manualPDF 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_off0000d678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD678 18048 bytes
SHA-256: 5667ec61aeb103f5650ec159c7938eccc15166b338723d4a1c35536468013fd6
font_01_sfnt_off0001056d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056D 11928 bytes
SHA-256: b3a0ad70668bd9d2d4472b2a15b3bb67a4a6e858e262ed03eaa01f97c56eec62
font_02_sfnt_off000121d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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