Malicious PDF — malware analysis report

Static analysis result for SHA-256 6532d66a5c6f2c7a…

MALICIOUS

PDF

81.2 KB Created: 2021-09-09 20:49:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 22731be6437b1ba5e18569338b98a9c3 SHA-1: 4a73f9d7e9b2dac7b6050628c67837224fff7cbd SHA-256: 6532d66a5c6f2c7af06d4ca34344fd4a594b00482a4f9479287d659caf412a9d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains a link farm pointing to numerous disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and unreadable, suggesting it's not intended for human consumption but rather to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://mcsfood.com/images/file/35568819725.pdf In PDF document text
    • https://geniodelweb.com/file/97920727842.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///70960701108.pdfIn PDF document text
    • https://www.naabelectric.com/userfiles/files/93064160388.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/80761015920.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud/files/46327935117.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/58141676912.pdfIn PDF document text
    • https://medbillings.us/lightspeedweb1/file/judupotanusijav.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109011518259261.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa87de94bf---73221375733.pdfIn PDF document text
    • http://ropesadventure.com/d/files/voxomokizajekibijajided.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/jujewigut.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/80802215049.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/98119149895.pdfIn PDF document text
    • http://halmar.info/userfiles/file/17824825396.pdfIn PDF document text
    • http://otworz-biuro-podrozy.pl/userfiles/file/46456121737.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/lukaj.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/215c9a365621309560f1135dcd8ca13a/wewog.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/29495868867.pdfIn PDF document text
    • https://yellowmangocafe.com/userfiles/file/gewirit.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/gujaxusuwud.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/29f06b36557aba81a82012f37406259d/83649075906.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=coz1+mod+apkPDF 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_off0000d824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD824 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f03b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03B 10048 bytes
SHA-256: fc47a854ea7d7c7466f42b1884bdd449184bcabf34a15b81f8798376808e1c4f
font_02_sfnt_off000106a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A3 19060 bytes
SHA-256: 319b2b2bada5859d2be62e83ed383bf7d5f78ba3d7e3c2f8eb201cabc95c0c79