Malicious PDF — malware analysis report

Static analysis result for SHA-256 922e09c07eaf87ca…

MALICIOUS

PDF

75.9 KB Created: 2021-09-05 00:13:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b9a1da1015123938f4c79027e3497c26 SHA-1: e975f558531b86ebb79e666022e1bc1e33b16aff SHA-256: 922e09c07eaf87ca1cdc99403a7814513a1bd82a47131a65b5a580ae8009381a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The primary attack pattern observed is the use of a malicious document as an attachment in a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://wonkingchina.com/d/files/82222438539.pdf In PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/telulelu.pdfIn PDF document text
    • http://heizler.hu/files/file/44970706282.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0b550cd81---60654976342.pdfIn PDF document text
    • https://betamachinery.sa/other_files/File/4592927242.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160998b60990be---posipapinuvimefapobonam.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1608151bb5abbb---matabukojanitopilubabawu.pdfIn PDF document text
    • http://slsnn.ru/content/files/40116146939.pdfIn PDF document text
    • http://orel-trinity.ru/sites/default/files/file/wozuwofer.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/lemoxavorop.pdfIn PDF document text
    • http://slxiang.com/v15/Upload/file/202192147288070.pdfIn PDF document text
    • http://kwartetproforma.com/userfiles/file/sutunaderunugibubulavonu.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1610ffbf953825---wetixilawowolu.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/tufevuviwe.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/noxojuz.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/63399721717.pdfIn PDF document text
    • http://slp72.com/clients/7/7b/7b902bee17765b19ebdde6030f24742d/File/tolukufuduxamawijepisin.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/c6e4b2e5dc99ab3fe6c812bc34d057fe/gusezaruzosaroz.pdfIn PDF document text
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/pigipedisonuwomiremex.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/39939433564.pdfIn PDF document text
    • https://performanshost.com/calisma2/files/uploads/badamumaxa.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160863b65a00f0---bonetinajozigikux.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/3a5h9f0gl94co56jk08so2sr51/65557406999.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/kawuvubege.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/97167876953.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=le+chaperon+rouge+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_off0000c661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC661 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE73 16972 bytes
SHA-256: d1f1cd424193e9c6e757b2e49fa3181a3c94679c9e498dd12ade0b640aad2a78
font_02_sfnt_off00010a87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A87 10552 bytes
SHA-256: e37f93d6fdb081e01ba9f2ff192cb0790ff2e6c2451c155b841dc246ac110547

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