Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aaa1f3b5e6eeeee…

MALICIOUS

PDF

89.2 KB Created: 2021-09-11 20:24:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: fe767e789da89ee0fc045d920f22f5e5 SHA-1: 3e82863e84aa528e8487866179da85e0cae19ee6 SHA-256: 9aaa1f3b5e6eeeee86533415a991daa7597ff10fa111036f6d9ddff4748e9d2e
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate a link farm designed to direct users to potentially malicious content, consistent with phishing or malware distribution. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://locktactyuma.com/ckfinder/userfiles/files/85390544064.pdf In PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/b996ca2cb13e9b90fcc6501fc06b4597/16793103062.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/77278129408.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e92282d34---ziwumosemubegejetoj.pdfIn PDF document text
    • https://people11people.com/uploads/File/taworugodunigalaxoti.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/28097218922.pdfIn PDF document text
    • http://gaia-onlus.org/userfiles/file/jifube.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b508bb2790---siputovawek.pdfIn PDF document text
    • http://ccsilver.kr/files/fckeditor/file/13128512096131a52e82c7a.pdfIn PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/4499136237.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/xutipobinogaxudopopeweb.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/runusuwap.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/71414885584.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/13603319041.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613bffd167dc1---tixun.pdfIn PDF document text
    • http://traviet36.com/upload/files/vimunuzesisi.pdfIn PDF document text
    • http://gorod-r.com/userfiles/file/tumuwew.pdfIn PDF document text
    • https://scalping.ir/data/files/file/namuvavegeralukib.pdfIn PDF document text
    • https://juraganmonyet.com/contents/files/3356274787.pdfIn PDF document text
    • https://snf.styleguides.ch/userfiles/files/26260461710.pdfIn PDF document text
    • http://rracc.com/file_media/file_image/file/mezavodu.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/21204858906.pdfIn PDF document text
    • http://madurastones.com/userfiles/file/lesenoroxanogiki.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/71304413136.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=k+with+wordsPDF 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_off0000f935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF935 9976 bytes
SHA-256: b1288fc848b132879d13c430aa6cadac4bf683056b1fb3e312aaf7706b6c8d7a
font_01_sfnt_off00010f75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F75 18408 bytes
SHA-256: 0679b84a1e208af471d18b837b0f9b4a7b255d606b2867f3d79cc8bd8f49681c
font_02_sfnt_off00013f04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1