Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab1929d4575c4282…

MALICIOUS

PDF

75.9 KB Created: 2021-09-02 20:19:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 867c56f94bd823129e43a28f8c773791 SHA-1: f2a082530b8b3a8f37b54bc8424c65085a6c3b09 SHA-256: ab1929d4575c4282c7e184f4457195c39344dcdcd0835523e852bf6f8ea27657
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised or disposable domains, indicative of a link farm used for phishing or malware distribution. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160718bf032c01---bulolumo.pdf In PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/jotosi.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/kaxoluxezom.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/0h94ppe66qt0o0c0msjj1vt255/11809093518.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a00330b675---futumerugudugebofidekiv.pdfIn PDF document text
    • https://computerzone.pk/file/34591427789.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca17cc70c6---97067958006.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/0ad20d51fda46a0057e14c402ac2e65b/57143254598.pdfIn PDF document text
    • https://ferropula.hr/files/79703620045.pdfIn PDF document text
    • http://interstyle.org/content/xuploadimages/file/laxilusuza.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d8c84b4cd---fonanesedonuwo.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///nodedudizonevonigenavitow.pdfIn PDF document text
    • https://arabadvertise.com/userfiles/files/nufagusosamitupakefeni.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/60535494762.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/12u7etcj9okkdi8l7pk1r8bi37/64882717539.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/f22f63125f461d40b4f0892003f229f6/57455876685.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/bomudinowexida.pdfIn PDF document text
    • https://kawanmto.net/contents//files/sanufemope.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/85a410672f7bdc9d0b4e6622db80aa65/55111755440.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/miwugomazuramuxutugosexuz.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/forebukijulanawelenizud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=la+camara+lucida+roland+barthes+pdf+descargarPDF 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_off0000c0a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BF 11264 bytes
SHA-256: ef904e799a3f9d1fcc795ec077cac5a15bca3e78ee6b4beb070916079732f8c0
font_02_sfnt_off0000f282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF282 18384 bytes
SHA-256: 60189424c51e3ddb8d741e4431e84aee6ea34deae95d89417f3ba707dafab5ca

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