Malicious PDF — malware analysis report

Static analysis result for SHA-256 09dea8d9ccbd21d4…

MALICIOUS

PDF

141.6 KB Created: 2021-07-02 10:27:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b4b033d0e5b7d7cceaf795ae8d31b195 SHA-1: d78d58906d8aad1eae6d5bbdf2c0eeaf48af5796 SHA-256: 09dea8d9ccbd21d49012ae274180a4c8ce9403b1041364083c7a25deb81e1ab1
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, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or downloads. The document body is heavily obfuscated and does not provide clear textual lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://baraanduliaptti.org/userfiles/file/kozunejaxibimejefikukaf.pdf In PDF document text
    • http://goref.ru/files/file/ronuripivusamuxutas.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609427649c51b---34494067297.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/valadarivetudipetu.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/jadojazizejomonedibezuji.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/4c1e71b2e09b16dbdbdd17338144644b/ropexonigiweli.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/kamilunukemuzizejaz.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608214c120c95---notunakanoxas.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/kevej.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf547a733c---61310968958.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fabizej.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/sutetejibofexi.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/noxolemibo.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd9bd30793---48429198868.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b9a9de08e---99846620197.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/59379842729.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085cd2269cce---dufukotesovifuxojeji.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/d0cfa6108d7a4b84348005740be9243c/widejovasurobezen.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/clblgkbtfaukq6vpkutpe4c3q2/67657289004.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f63bd654c0---wadafa.pdfIn PDF document text
    • http://bbbswalkforkids.com/clients/c/cf/cf8d0549bdc9bbdffca8bc0db9808b96/File/63769651704.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/vnt8r64ec3kgo67klm7q0d7lkd/34466216465.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=the+world+of+beowulfPDF 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_off0001c55a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C55A 21276 bytes
SHA-256: a7080832e9c5a652ec47832f9952029511b605e478e0e0584bdf80906046b8ea
font_01_sfnt_off0001fa2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FA2A 10116 bytes
SHA-256: 9d0b7981606b922313a653a08305a5d666e2d69be43b9118614f714a14754a82
font_02_sfnt_off000210e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x210E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1