Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b1020c83d905a5f…

MALICIOUS

PDF

83.9 KB Created: 2021-09-02 05:00:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b4fc89d254fd2277fe69104f85b95211 SHA-1: 3d991b604a4c74943ab59ab0280c9c01c23da7e5 SHA-256: 8b1020c83d905a5ff9c728af608515c100681f29b672d4ca31d04a0efdadd446
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608add0fa19d9---53986463758.pdf In PDF document text
    • http://airconbank.com/upload/fckeditor/file/61085731562.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/ludulelurej.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609c94ea61f8e---toduduni.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/lizanumavisutebexonana.pdfIn PDF document text
    • http://teraval.cz/res/file/82915550757.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfe3e69a59---73310808280.pdfIn PDF document text
    • http://lalinpress.com/ckfinder/userfiles/files/lidegisovefifexawego.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612ada2624d29---70282783744.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/xetexezetet.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/nibasot.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/5d2724f8257a53e4b07cd38b4db2b9ba/62550056782.pdfIn PDF document text
    • http://tulga.ru/editor/files/zaxafesipunewogadid.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/7tfnvgtjcvqo14519jo5j5a3p0/90079907198.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/wigeremofemomotupasotanov.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/5f27e431b0e4da24d192afa56af6cddb/88472042749.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610cc3925e722---58589773494.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/jutewazizesetegirexutawa.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/89471877965.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16097503a2d4cb---bekexegodizuxoni.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160838272c0367---53209888001.pdfIn PDF document text
    • http://4darchitecture.org/img/all/29047526527.pdfIn PDF document text
    • http://whalesart.com/uploadfile/file///2021061604441082.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=temporal+fossa+contentsPDF 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_off0000e2d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE2 18116 bytes
SHA-256: 8cab59749c787e9b4b37b6d48ed0583a14e031e4dc4193db7d07d633b602d8ed
font_02_sfnt_off0001297b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1297B 10512 bytes
SHA-256: 2b761cb77cf6b217e6fad9078c7fd0fd2bbeddaf4af3462a3524d31f3cad9caa

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