Malicious PDF — malware analysis report

Static analysis result for SHA-256 883686bb728da231…

MALICIOUS

PDF

75.0 KB Created: 2021-09-06 20:35:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e12f9eca218d0f4c8fc341519f381b4f SHA-1: 80b3fc45f645a2148ecb3a608e1e2a64352fc562 SHA-256: 883686bb728da2310e388cb3721848d006e3bca3fa4f0a77dab21de84819d63b
96 Risk Score

Malware Insights

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

The ML classifier strongly indicated maliciousness, and the PDF contains numerous links, many pointing to compromised WordPress sites. The document's structure suggests it's designed to lure users into clicking these links, potentially leading to further compromise or phishing. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160875a1b9a9e4---18387436553.pdf In PDF document text
    • https://vicotelecom.vn/static/source/images/file/77212846310.pdfIn PDF document text
    • http://yesfabric.com/images/upload/File/kixesux.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/lq9dok8vmaceg105f9jcbja4q5/jalenexi.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/15285818980.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/kojedupopav.pdfIn PDF document text
    • http://olversonfamilyreunion.org/clients/5/51/51a48c89da211807e19ed56f8a1a1822/File/pitokotani.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/milazodisavudi.pdfIn PDF document text
    • https://kiameds.com/images/upload/files/radepewuzemaka.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161252e0739482---85779943460.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607061a6493c2---98605491212.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/69276657763.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/2f26a03fcd7668a5b7e6cc453a85a0c1/46075537889.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/desamepuwikibugikixove.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/q6dqcec51ktfmur8h25a3luc4u/69579378491.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/45225194168.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210627092757_st9fwp.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/5b41n6dunbb68081fk6nt5ok99/tijim.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4bdd57454a---86375537629.pdfIn PDF document text
    • http://saveondealz.com/ckeditor/ckfinder/core/connector/php/uploads/files/regadetamunajo.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801cba4eff0---25351135659.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/84077124908.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=arta+subtila+a+nepasarii+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC047 18372 bytes
SHA-256: d469a432d186c53869b5b7ac6f30e02fe61a7782121dcde9c0764a7d6eeb2eb4
font_01_sfnt_off0000ee53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE53 10592 bytes
SHA-256: 8200b50514495c72490df373212bc3cdefc453638684999ecf9b71358cc31ef7
font_02_sfnt_off00010668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10668 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1