Malicious PDF — malware analysis report

Static analysis result for SHA-256 de9edd802c24e870…

MALICIOUS

PDF

80.2 KB Created: 2021-09-15 06:54:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7974b1f5d510bc9145d2f1d920b67532 SHA-1: 46428eaf47818ccb69cfad78ba513face325678b SHA-256: de9edd802c24e87090fe0e3fd33e116343f6091649e95336ecb10196a73a7e9c
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains a link farm pointing to various PDF files hosted on potentially compromised or disposable domains, indicating a phishing or credential harvesting attempt. The critical heuristic 'SE_SECRET_RECOVERY_LURE' strongly suggests the document's purpose is to trick users into revealing sensitive recovery information. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing campaigns that often leverage embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://wodepcb.cn/uploadfiles/files/5600348122.pdf In PDF document text
    • http://klhl.com/userfiles/file/teruw.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/selanokireroxezejabuv.pdfIn PDF document text
    • http://uteambio.com/upload/files/17304682702.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614036da4677a---27398543335.pdfIn PDF document text
    • http://519pf.com/userfiles/files/vokedugaxolekuxuzupi.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410d9e7516b---36839601435.pdfIn PDF document text
    • http://husplaza.hu/editor_up/nulizuvidowalowuri.pdfIn PDF document text
    • http://sp2wronki.pl/fotki/fotki/file/tubisotexokemokutesutiw.pdfIn PDF document text
    • http://www.bash.cl/media/file/19963601857.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c99e26cbe---ditawodomujedugela.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614110364ece0---fosiwugowifesegad.pdfIn PDF document text
    • http://musicincw.com/fckeditor/userfiles/image/dovofukarejatozoma.pdfIn PDF document text
    • https://pasarantogel2.com/contents/files/kajujomej.pdfIn PDF document text
    • http://dichvuhangngay.vn/uploads/image/files/62490074241.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161416493a0d45---58190414848.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/sukavis.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/79027332460.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/xelatunuruzomotisefezaz.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/92135180456.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210908_0F5A397EB4BA6E47.pdfIn PDF document text
    • https://zoldlaptop.hu/ckfinder/userfiles/files/lisoranelimozugad.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/nifaripobalekaxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=my+android+is+not+receiving+textsPDF 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_off0000d4b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC7 17764 bytes
SHA-256: 538b2952cbaa03e810ee3a3c90ba7751ab351cc8419e11932cfbac91513d57a1
font_02_sfnt_off00011a7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A7C 10772 bytes
SHA-256: fccf9caf567f65898e2ebf476aac5b495986beab0e2f78dc3dd20c2184801357

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