Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4ab1615268d84b8…

MALICIOUS

PDF

77.0 KB Created: 2021-09-19 10:48:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 533350bd9261efd1efe2f89277fed87d SHA-1: 5c5ec20d9625b6039c78a1e484aaad36c17225de SHA-256: a4ab1615268d84b8af1e62fb92ff2ff1bcbd49bfaaf6ef8ba8bdacf3ffacb890
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • 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.
  • 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=android+baterai+5000 PDF link annotation
    • https://icrs-as.com/userfiles/file/nuxog.pdfIn PDF document text
    • http://thehedgerowchronicles.com/ckfinder/userfiles/files/1445356141.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/49783638677.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/19205637457.pdfIn PDF document text
    • https://bunianco.com/other_files/File/segowepuxof.pdfIn PDF document text
    • http://uni-soar.com/userfiles/file/wapavukil.pdfIn PDF document text
    • http://1000projects.ru/upload_picture/file/72796114661.pdfIn PDF document text
    • http://travel-door.com/userfiles/file/gurebiwepu.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/4688f941738c062d392ee6b5a7715925/tisodifurilukuveroguroge.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/33101553474.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/75293893581.pdfIn PDF document text
    • http://panel2conso.com/userfiles/file/gukowuzulatalebe.pdfIn PDF document text
    • http://sbkf.org/files/files/pixowuvujatinebopeso.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/mukegakuxavubomavetok.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/609b40ea4ad7ba533b9b3f60d82775d1/33941315581.pdfIn PDF document text
    • https://ezokniga.com/uploads/file/wusoji.pdfIn PDF document text
    • http://ljsmelt.com/upload/files/niwudufuzimizera.pdfIn PDF document text
    • http://lagrupacio.cat/file/9325487112.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/38758501809.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/45067a32f2f3cbf90f7d06ba1dd60f27/91106328122.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/rojekezopusetenado.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/5782363987.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/6153319cc186f40ed8e3951d6c96bab5/bofipanijukokok.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/wezonupegexizinoro.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_off0000caa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA4 17196 bytes
SHA-256: b91b02952ef738be6e17a72e4002ab6ced3f6db2b4cc38160579fa200461b961
font_01_sfnt_off0000f72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F42 10404 bytes
SHA-256: 5f55ec8fbbdf25ce97cd47a996171bb47aa9f057c9410095332f0a0c44305bfc

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