Malicious PDF — malware analysis report

Static analysis result for SHA-256 99f0e107feb7792f…

MALICIOUS

PDF

85.3 KB Created: 2021-07-07 08:52:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b417ce65fff315d50306f1f5ce928a35 SHA-1: eb2f331500e9fd3c7d084a664fa3c23f6c1c04bc SHA-256: 99f0e107feb7792fc2844a247ec7da8e141447bebf4ff687cf554ef8fa253ee1
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure itself does not contain readable content, but the presence of these links strongly implies a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://pogservice.ru/userfiles/file/wiximinujaparezesajuvef.pdf In PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d2256543d---44697907020.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160745185c1c83---33759681885.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/bef4854df9829acca98ee8874034f374/sekebumopigamas.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/suxugufizasuzelumu.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/6048867945.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/tisof.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/3dbe2a4ab5c6b6436fa638ef958c900c/momup.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/qbgfe90i9083bcvq6tdvqru358/sumuwafufoxonatuwetome.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/68587805287.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609847ec6b16b---74247633683.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e192aea7e---tipakekuragenerepos.pdfIn PDF document text
    • http://nktrading.qa/file/files/bebinomobupokel.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c246b8b3e38---86827167011.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/65987536324.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/9me54npqnc43606l5rbetl9ngf/31490930773.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160782e4297228---firedoxafin.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/0948fe9f22663a0695ca884c6ec025a2/23281295.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/ac5eed90b7a4a7f2346830c15c645a0a/pemutidepemonawevaperegi.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bca803360bf---63091953639.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/99682673161.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/79119854345.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/79544438755.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=duodenum+function+in+digestive+systemPDF 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_off0000ea7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7F 17108 bytes
SHA-256: 666aa053ca72f8065a9b27251f8e2ce93599a19bfc3302c93fcff2188c8e63a9
font_01_sfnt_off00011714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11714 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F2B 10792 bytes
SHA-256: 72de63fe5ed4f7e8b49e25230bfcd45a93896f694ccdcf68c5dd3311c3ce7497

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