Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ed05762c38ecbdd…

MALICIOUS

PDF

89.9 KB Created: 2021-08-31 15:05:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bb9b16b3e022570a33fe665eff7cd922 SHA-1: c027d57b160dfdb18989bfb5f0f67fe71f1b6548 SHA-256: 6ed05762c38ecbddba03fcf59b8aa52b4d2c25089b9ad43ba1db9b1e6ece18a7
96 Risk Score

Malware Insights

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

The PDF contains a large number of links to various websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to manipulate search engine results or phish users. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://crysiq.ru/uplcv?utm_term=armour+thyroid+weight+loss PDF link annotation
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/nidipap.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/jufekatere.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/kq8tcag6r6m9ovgsuds5rl4h6f/2574788650.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/xeninenigiko.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ddaba13daa---35803778532.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5572e040ad---lipozozuvofawa.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/2822366263.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/22910383934.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1611ad09985e7f---11381065078.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/36354628439.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/xaxipujukazopas.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210626035654.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/c3987449661c70d57b4ca6cbb07aa56f/davikufif.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a729100f9d4---dadunifexipimozugorexon.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/9718541919.pdfIn PDF document text
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/ponidaramakew.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/95613476319.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/24168025971.pdfIn PDF document text
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/wezopazovulewuju.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/4476175983.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16094a1538d40f---dufipaliloboguri.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/raruwizesegag.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_off0000fbe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000113f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F2 17948 bytes
SHA-256: 7e23c69ae010ecff2b322258e70b7d9f7a1ac3c8540800a4ca2d736504d1b21f
font_02_sfnt_off0001423d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1423D 10708 bytes
SHA-256: a9819c95b720de67a1935eda6b54429f73ed1dce5103bb78f4fc7a76f89f9d6f