Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ae465d00e207439…

MALICIOUS

PDF

79.2 KB Created: 2021-09-09 08:51:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 671c9758dba9a70f7013a1ef5129e3af SHA-1: ac8a5610d8e07176f13b504de08ef196327b3596 SHA-256: 1ae465d00e20743982fdefe7aa73752f08f50387b5556b5c4166ce3ce637b80f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing lure or a downloader for a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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.
  • 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://crewmak.ru/uplcv?utm_term=combustion+reaction+for+hexane PDF link annotation
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133684ee13dd---40670177146.pdfIn PDF document text
    • http://smingames.com/ckfinder/files/65742855678.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc7e56f6d8---60828004747.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/momabipise.pdfIn PDF document text
    • http://salwex.hu/file/rosiwojumowa.pdfIn PDF document text
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/derenimuxenuwotetivewi.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/8361964616.pdfIn PDF document text
    • http://skisun.it/userfiles/files/betamefatonev.pdfIn PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210905151352211213w0vgk7.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/7b464471921be1d960eb1256e12d4369/sodowukodemubelalumofe.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58595105008.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/befidetemoxuka.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/18529720941.pdfIn PDF document text
    • http://obkladacstvikolar.com/content/38184643723.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/nagudetevi.pdfIn PDF document text
    • https://adikketiga.com/contents/files/91693873649.pdfIn PDF document text
    • http://wirheiraten.de/images/file/patejiburexuju.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/51867865820.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/vawaguxizakezixu.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/4052774320.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/kajalulubodemafudar.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/493n9rhn67u20mpicpt0dk2649/38761784918.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/bokoj.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/83873853248.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/25983946806.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_off0000cee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE1 10928 bytes
SHA-256: 8368cc7efe128b966a45ec74480ad0ed9f066f70f142aecd7bd683a46237969a
font_01_sfnt_off0000e80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80F 17368 bytes
SHA-256: a1293e31ae34c4fa0b5d40fd6f0f5068a6635d03ce9ec2cc55f8190f2b788027
font_02_sfnt_off000114f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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