Malicious PDF — malware analysis report

Static analysis result for SHA-256 45086c07aabec763…

MALICIOUS

PDF

96.9 KB Created: 2021-08-10 16:42:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4be6fac4f96b049ca748e7a871958ed1 SHA-1: 34feec39e99a33226f2c549e92a5ba4639280ed7 SHA-256: 45086c07aabec7635a866b78102dced250de9fa3d3f755946d4e8b4cca5bab22
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to multiple domains, several of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites. No scripts were extracted, but the PDF structure and embedded URLs suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4a0bddde3---31014305526.pdf In PDF document text
    • http://onishi-kyosendo.jp/archive/wuvowijetativu.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/23795849559.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021080418455760.pdfIn PDF document text
    • http://thebestpearsonfamily.com/clients/e/e6/e6a49a9b6fa3fb0349b1957bd02e8b5b/File/goxutipijemunora.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f29636466c---82120701412.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/xujirukudugotukobetow.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/79049902476.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/72197231273.pdfIn PDF document text
    • http://charivne.info/images/file/37369124698.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/6uivsoejntkdv5utkr0htmcs30/vosanufur.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/pibelewarugivofaf.pdfIn PDF document text
    • http://stewartreunion2020.com/clients/2/2a/2a0d9dcdd57715375c9f4393c24df0f2/File/15247875040.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/51853675081.pdfIn PDF document text
    • http://guowangcable.com/d/files/pesuxagejuwavi.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/ed81e94cd0f1eeb414a787e49298ad2b/44694812683.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/48618672204.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/6cf51373b524372390b8a5ddc2042281/zufolijobogu.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b43ddf794---nakobiwuf.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/mexulogunajulexi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=ramayan+chaupai+lyrics+in+hindi+pdfPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FD 4236 bytes
SHA-256: 1d141f6db0ac182aabb20c5df4b38cd2d007c01ce8b1f9f1b830bcf5f460b674
font_01_sfnt_off0000f8ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EE 10792 bytes
SHA-256: a74889f79982f7d16317a4955ca294db486d901b879800f1cc6241620a23c0b6
font_02_sfnt_off00011185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11185 19324 bytes
SHA-256: a0173ff6828093f04a4c5fb94771f0387268a0569591269d1b3dd77e8ed6f7bc
font_03_sfnt_off000143ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143AE 16528 bytes
SHA-256: 312094e05bea33dd0d39501c7d4b96dc61523d61527f51a03f3727eb87199a7f
font_04_sfnt_off00015adf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15ADF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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