Malicious PDF — malware analysis report

Static analysis result for SHA-256 91fc1d88baa8b9e4…

MALICIOUS

PDF

92.9 KB Created: 2021-09-06 06:11:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6bf46837a6d7fd0cf2a972e95563d205 SHA-1: 257dcad773c0dd7533c98b773a2e45b4834524e4 SHA-256: 91fc1d88baa8b9e44e815114a50cb1f2d53c097d63c7bb5459e0a115a1754b11
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external URIs and links to compromised CMS uploads, indicating it functions as a link farm. The primary purpose appears to be directing users to potentially malicious websites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://ketchas.ru/uplcv?utm_term=educational+psychology+anita+woolfolk+pdf+free+download PDF link annotation
    • http://recrute.fr/files/files/mejadakepaxegivagabe.pdfIn PDF document text
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/3226540878.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/e054c2a0a1228f874e53ec0afb350758/jovugoruvizewuwor.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5e7947827---dijuru.pdfIn PDF document text
    • https://melz-feu.ru/upload/sofoxozubiwizivizaza.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160770d46c4283---vegiwe.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/74715485886.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/57236243346.pdfIn PDF document text
    • http://piscesappliances.com/userfiles/file/56174338118.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/bd4a7c72db12faeb8b2a99d923b0c7c1/vimuw.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/45928152133.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16084ef1a57aa1---28254003208.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16078a393e0c9a---wiwijeb.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/10161875585.pdfIn PDF document text
    • http://kechengchem.com/upload/files/43134840199.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/mosisus.pdfIn PDF document text
    • https://trainova.com/userfiles/file/51850706197.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/30292027823.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071bdacd52db---sixexazobixazukites.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc09e6e082---74793397154.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/1496665862.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/da38d687af3997b2500b760b7e0ce54a/mupalenajunewonopezurum.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/dudukinonuk.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/rq4e5a7gv88e5qcu8tpp8b54o6/56816695380.pdfIn PDF document text
    • 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_off0000ff6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6A 11276 bytes
SHA-256: 4283a10dc425366c2380a8d4ed096513d0a3827dbf9c96b89850a640b59df1ea
font_01_sfnt_off000119b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B2 19600 bytes
SHA-256: f3fcbcc7b629632c38863358a900c9d6352b8d6d27e6b9591cc8fb225b574603
font_02_sfnt_off00014d80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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