Malicious PDF — malware analysis report

Static analysis result for SHA-256 157f40e9875a727e…

MALICIOUS

PDF

99.4 KB Created: 2021-07-25 06:53:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e774e045891c0f2b4c272fd308d55904 SHA-1: cf603988631d7ea718eda348bfe0a8c148c4e137 SHA-256: 157f40e9875a727e6aa66cadbdb52f860f468534498bf10fc79e825ba2835c85
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and a link farm indicates an attempt to lead the user to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://debeleven.net/UserFiles/File/50089202864.pdf In PDF document text
    • https://securitydm.rs/slicice/file/zesadebaje.pdfIn PDF document text
    • http://meadspool.com/clients/8/8e/8e46726fd42f39913d2349bbdb4e70c4/File/97078263329.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b74f29d66bf---29929592270.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ad6b4b1e7---xezutanefi.pdfIn PDF document text
    • https://unifor975.ca/userfiles/file/fulolodaluwi.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074392a73944---bakinopegomatiwiweta.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f0fa0fa74---govav.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/69834102597.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072df6637b1c---kuzizixirotogu.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/da9c8e5d26d32b9a663b13ff8791fdec/bozerejojajuf.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/dunizovaxemutofujifa.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/pexojanimiwodizepan.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/e7d31b0360fc9d7c5f2346f819a42f3e/18029569898.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/pd22bbaomtqmo20rs6erurv504/fukoxirarut.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/d55fb138b224ce8bc33ca3e4870fac1a/72372060323.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/3p26k7k974u4jtld19hrsh04p3/rupik.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/lulimerurowaxigurelar.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b686945fe2---xofabetejudifosotew.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/2877505625.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/xamopigugo.pdfIn PDF document text
    • https://laser123.com/geektic/files/ravitejogabu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=weathering+with+you+full+movie+eng+dub+facebookPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12776 2696 bytes
SHA-256: b81c106f99475d2bcc1faf27218844d670efc739612ace5389c3cc75ab229d9c
font_02_sfnt_off000132aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132AA 17784 bytes
SHA-256: 58f3c127fe63dc8b511b439eb310ca9c508b3bf14de12bd60451b6cbd8381d6d
font_03_sfnt_off000161cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161CF 11344 bytes
SHA-256: 738e088a42f6eabe778e756b2b97d3728a0fd9e6d98d401d632b9a13142b7db2

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