Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba1d575c6587d300…

MALICIOUS

PDF

79.8 KB Created: 2021-09-23 09:10:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 83dec08bb8cdda6d6d2d6ae824f252aa SHA-1: 0c31e3ad3f6d4225564b8edba3b11927ffd3d69c SHA-256: ba1d575c6587d3001e7e2ec365ef2bd288ba6722c5983926a1cb3f5a427327a6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to various external URLs, some hosted on compromised CMS platforms. The presence of a 'download button' lure further supports a phishing or scamming objective.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://startent.ru/SITE/files/editor/file/71995622302.pdf In PDF document text
    • https://ixiu-23.com/uploads/files/202109061257492607.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/57978734246.pdfIn PDF document text
    • http://gfb.it/upload/fck/file/ximat.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/kivugibabutenexiruref.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/kivokikolixojopabupa.pdfIn PDF document text
    • http://thecuriosityshot.com/jisipe.pdfIn PDF document text
    • http://tochuchoinghi.org/files/1902699345.pdfIn PDF document text
    • http://deesudcoolingtower.com/userfiles/file/10228987089.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/jasumurow.pdfIn PDF document text
    • http://immobilieninvestors.net/userfiles/file/80007532794.pdfIn PDF document text
    • http://vertex-decor.com/userfiles/file/97278466385.pdfIn PDF document text
    • https://happycondo.leaddeehub.com/userfiles/files/19422090772.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3185e32a95d1b176af3b46fb8537d55d/derorejarutinegusevuwu.pdfIn PDF document text
    • http://merklink.nl/site/data/ws/files/23382542683.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/78178566602.pdfIn PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/bemanagegebom.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/fojawosunasa.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/4da1c1a5caec1a3f670e32782c9fe7fb/25467700367.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/883eg8raii1c7u4v7s3u3mg4o3/zowisifugekovamuzatu.pdfIn PDF document text
    • http://kesifveotesi.com/files/13276618280.pdfIn PDF document text
    • http://purepoem.com/resource/docContentImg/file/2021-09-16/c488cb834b4468e6c1fb86b9fea75ca8.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=v380+pro+apk+for+pcPDF 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_off0000d250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD250 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA67 10396 bytes
SHA-256: 7e5d8251c34941692ca3667baaae860c3a52aead12501f49586cbb1ea535afa6
font_02_sfnt_off0001020f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020F 17932 bytes
SHA-256: 4f039fa95bfb6c8133b0e3dd42adc44fce74bae88c21ac548d9f4e71eaa063a9