Malicious PDF — malware analysis report

Static analysis result for SHA-256 31313b87c815a586…

MALICIOUS

PDF

118.1 KB Created: 2021-08-27 05:56:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 08fbcc55f917a30d250f16d2d23dc4d6 SHA-1: c224e720449a42e5cb4cccd4e37ef033a3fa08e8 SHA-256: 31313b87c815a586505e1fde4f867ca3a0ed7abcc13db5ef5cc49c173de6b6f0
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model with high confidence. It contains a link farm pointing to multiple compromised WordPress sites, which are likely used to host malicious content or phishing pages. The presence of external URIs and link farm heuristics indicates an attempt to redirect users to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6dc856ce75---65549177967.pdf In PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/xinumakabijaruxebat.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/a476ca885784632b964e9cafc7271cc8/94300890854.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/gezogizagigudob.pdfIn PDF document text
    • http://elazentrale.de/images/uploaded/file/benajebadopojamawav.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b4f9a7e1a---84148554075.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/dedofuweluruvizapovip.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/zirikasigigavolijus.pdfIn PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/75849911245.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/35512551808.pdfIn PDF document text
    • http://millecolori.it/images/file/93256259360.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/xosup.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/defasiduxekagekawarerosek.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/mudulow.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611614a76bf71---78363437554.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/pudagaluvifukekipove.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16076f13985ae0---78041201140.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/roxujedelim.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/05bc9c6a1a8558a8b10a26418cbdb4a6/bifunisibapojevakuletu.pdfIn PDF document text
    • http://sshs1962.info/clients/3/33/33dcd814b32da85629335a95ab3d0158/File/57674501015.pdfIn PDF document text
    • http://texmet.pl/userimages/file/9672170247.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/rfm1fc13h05o5e1ujv6fg3eufu/14391309628.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/uf5civbojnlct37kqadee8k7bq/fivaramopiro.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160725f607fb98---48314814338.pdfIn PDF document text
    • http://czechnews.cz/userfiles/files/pekavag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=the+dialectic+marxPDF 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_off00016705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16705 10308 bytes
SHA-256: a3a425827eef1e6006a76d4a294fbcc370d8649817f9a0e83cd0b09a6fec8d37
font_01_sfnt_off00017e2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E2A 19928 bytes
SHA-256: 8c2cf5f6c6720debf9d2556834b48b46bb921012308d21b04730356240a08a24
font_02_sfnt_off0001b18e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B18E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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