Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f80dd1ebbbd5eb3…

MALICIOUS

PDF

87.3 KB Created: 2021-09-08 12:54:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bf51c129f2448a0a6eed90d836354cf1 SHA-1: a2d95f3a7398e5de0cbfe76457f7dbeafcd757ca SHA-256: 7f80dd1ebbbd5eb3df21ba0a363bb8f01cf545a7f4a0df762e299cd5b127a44e
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to other PDF files hosted on various domains, many of which are flagged as potentially compromised or disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. No scripts were extracted, and the document body was unreadable, limiting the analysis to the URL structure and heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://ismart99.net/upload/files/73300910598.pdf In PDF document text
    • http://rilta.net/userfiles/files/digaw.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/6950428698.pdfIn PDF document text
    • http://eastcity.hu/ufiles/file/62415404170.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/xufufetipupibuzijogabaru.pdfIn PDF document text
    • http://aisne.proximeo.com/ckfinder/userfiles/files/65728451948.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210907213804008.pdfIn PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/37397489327.pdfIn PDF document text
    • http://llux.vn/uploads/files/jonabiwomam.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/29540692975.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/20733782971.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613803afba2ba---wumojozusorakozo.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/fupopesikev.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/patipiteliwivijigonuboz.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/174bf1759ef889f06042d07a61eaa1cf/xorabobugodezatiz.pdfIn PDF document text
    • http://ctcinsulator.com/uploads/file/fenexavafefetigit.pdfIn PDF document text
    • https://vinamex.info/uploads/news_file/nubav.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/20703908212.pdfIn PDF document text
    • https://slotpt2.com/contents/files/50867634072.pdfIn PDF document text
    • https://fluffy-chins.com/images/file/21754434299.pdfIn PDF document text
    • https://houstoncoinclub.org/FCKeditor/file/jasikawovifusivenipubirip.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382ca69d70e---39414241668.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/728857010.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/kasixuwuwoxajolizene.pdfIn PDF document text
    • https://estoniapools.com/contents/files/63518816030.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=difference+between+didactics+and+pedagogy+pdfPDF 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_off0000e9dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DD 19964 bytes
SHA-256: bd49a9d095ce0eac47f0d770963416a641f0495e9c11311b4002bdff71d7ceb2
font_01_sfnt_off00011daa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135C1 11088 bytes
SHA-256: 18c299639ef8b48e9f58636b157c6481ec89cdd48f68d20226dfe6859156381a