Malicious PDF — malware analysis report

Static analysis result for SHA-256 2773d2627b82ee27…

MALICIOUS

PDF

77.6 KB Created: 2021-09-29 14:02:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 5f03a0b2045c6c8f3045dcbb42d4ef3a SHA-1: 81b2b0593e25072355fb9827fdfb8624d640c685 SHA-256: 2773d2627b82ee2725bfff00a17cbbdbb2abc8866194083e0afd40c663e20b01
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm containing numerous external URIs, many pointing to compromised CMS uploads or disposable hosting. The primary attack pattern involves directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://queure.ru/uplcv?utm_term=ios+setup+for+android PDF link annotation
    • https://xosobacninh.vn/webroot/img/files/xenudukiwaf.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/gitinunelenazax.pdfIn PDF document text
    • http://kaies.net/upfiles/file/49293348299.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/delupawa.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/95658770196.pdfIn PDF document text
    • http://gonganmi.com/userfiles/file/45836189022.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/30283413187.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/retukojinin.pdfIn PDF document text
    • http://dongphat.net/upload/files/rudidelawataduzidos.pdfIn PDF document text
    • http://terminsk.by/pics/files/56132338700.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/f65n9p8f1qkukrcg56d40nr405/14374159439.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614f4c2e8f568---dibezozefefelozuk.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f78510594e---72360611672.pdfIn PDF document text
    • http://nanouklid.cz/upload/file/jimovezutakimetuse.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/pogatizoxobumemupu.pdfIn PDF document text
    • http://bxbrdh.marketsearching.com/upload/files/35896067242.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/5a5c1296b3c52e0bfada74ed79745611/fitukaxiti.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161417265ee269---17129690897.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/6525991212.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/pupumogamugabebosifij.pdfIn PDF document text
    • https://imagebrandstudio.com/userfiles/file/tudojavikogikimele.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/fadigivebo.pdfIn PDF document text
    • http://esistore.be/userfiles/file/47317400193.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_off0000c50f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC50F 10496 bytes
SHA-256: b765aebc514a6b3909c8a3b1467905c4ec888c2d99b0ba3e403fafa3a3d27020
font_01_sfnt_off0000dd0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF520 19700 bytes
SHA-256: 996209343baa7ac7360c446e24a80129c837d7044bfc853966e025ad3c99d1c1

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