Malicious PDF — malware analysis report

Static analysis result for SHA-256 129b890e9e15a6ea…

MALICIOUS

PDF

84.5 KB Created: 2021-09-13 20:28:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3f6679bf8a9a795be6f225e1c7509f93 SHA-1: 24181e6f35e98e56ab5c981fa0d6752eca6fca35 SHA-256: 129b890e9e15a6ea9e51f15e3e6a64e570791a202aa565edf7454c2acd9ba807
172 Risk Score

Malware Insights

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

This PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading further payloads via the presented links. The presence of a download button lure reinforces this phishing-like behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://k-sta.kr/FileData/ckfinder/files/20210909_FD64FE094ACE87F1.pdf In PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/28511406354.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/8790921760.pdfIn PDF document text
    • http://2safe4u.cz/UserFiles/File/55026423439.pdfIn PDF document text
    • https://losaltos.com/wysiwygfiles/file/nezawolugofosel.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/wumofanalifopivub.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/84700198642.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4c664a1be---95853427189.pdfIn PDF document text
    • http://www.sandipmallick.com/fckimages/file/jurifuruzufe.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/13921461182.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jubofo.pdfIn PDF document text
    • http://sofar-france.com/userfiles/file/51298908660.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/36008535667.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161393f4cebc33---niwud.pdfIn PDF document text
    • http://samtle.net/ckupload/files/mesowukopelumixuz.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/kd29p15gipkdtuklrntseglq04/jotosejetuw.pdfIn PDF document text
    • https://www.barefoothoa.com/webroot/js/ckfinder/userfiles/files/xebafamexakudafekexinu.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/13791702054.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/87383284499.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/8hactahfefbvco354hcukjkq0i/motimijaxusovezedujezede.pdfIn PDF document text
    • https://terracetemayonetim.com/upload/ckfinder/files/kiroxewegiwixijiwukozu.pdfIn PDF document text
    • https://morabia.fi/images/file/57556580298.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=nonton+a+quiet+place+part+ii+full+moviePDF 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_off0000e6d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D3 17552 bytes
SHA-256: 1f03371a4086c2d8e039f5d1cbd24966910b299933a7e4ba96dc03e90aa13a32
font_01_sfnt_off000113ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C06 10764 bytes
SHA-256: c62003369b085d1243f67363240a78cb5c68cf38d6113d319bd4549e2d6a803b

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