Malicious PDF — malware analysis report

Static analysis result for SHA-256 887b014cb7045fcb…

MALICIOUS

PDF

83.1 KB Created: 2021-08-18 05:37:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f680ebc250d8086767d49b5c0843cfba SHA-1: f27357e2e25ce551d1265524e4a17bb9e4d7f04e SHA-256: 887b014cb7045fcbc8dd9cd0cf6a0a1b028b3a3fd84db9f6723cb786c3ee07aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with 36 URLs, many pointing to PDF files hosted on potentially compromised or disposable domains. Heuristics indicate these are likely part of a phishing or malware distribution scheme, with ClamAV specifically identifying it as 'Pdf.Phishing.Trojan'. The ML classifier also strongly flagged the PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://mobilieroccasion.fr/uploads/file/niwilivetufutuju.pdf In PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/xedumabizulijaloz.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/mjqfkd6e1ui9aq8hl87fc49ger/rufoperovafo.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/losugisigenutu.pdfIn PDF document text
    • https://wineart.online/userfiles/file/xefizofobejapusatag.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/67782666640.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/6c3c65249371d6b414c2d649044784fb/33674726154.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/luzaxitiwofekeru.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16096d1374d511---fufegupolamuridadexutafi.pdfIn PDF document text
    • http://fluellensoflandreth.com/clients/b/bf/bfbe38bd58d8cb8bd08b82175287e3b3/File/vazawowufavite.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/lolujogaguv.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/95791988367.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/60427369528.pdfIn PDF document text
    • https://finatwork.com/userfiles/file/31227164555.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/fifununewaxeralakijaz.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/c1ff549467b0681e4d7cfba6d5ae372f/tiwoxulomon.pdfIn PDF document text
    • http://pettwayfamilyreunion.com/clients/39389/File/19108386606.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/f01056a5e70d15a2c0e13a0d64542833/dejedavirusidima.pdfIn PDF document text
    • http://lgassociates.in/uploads/45397679243.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/2210ne1rqllrdillknmv2ikhb4/85622222372.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/95002891342.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/53926803722.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105211111.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/lenijujasanoti.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/biviravugar.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160afba1f24c95---lifaravi.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/71327086690.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=sports+hd+dv+sq11+mini+dv+camera+sd+cardPDF 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_off0000dd99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD99 17756 bytes
SHA-256: aae272d10bfa16f697ac0b3c3dc1d367ab24221e31840dac5aab1c7afb3d500a
font_01_sfnt_off00010c2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2A 11072 bytes
SHA-256: 6183deb317e1c29220c4b2c0f169dfe76bd795221e265567c22914e5b987edd1
font_02_sfnt_off000125a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1