Malicious PDF — malware analysis report

Static analysis result for SHA-256 47ca8b1ba0c14354…

MALICIOUS

PDF

81.6 KB Created: 2021-09-04 11:07:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 03e9c4bcdf6fac041fa3aef3a97a5ecb SHA-1: d803913d020400622deddfe1309f24c6307e417d SHA-256: 47ca8b1ba0c143544ad3153e6074a0ee291b6f4b1ea2412125ca610690a65734
156 Risk Score

Malware Insights

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

The file is a PDF that contains a link farm pointing to multiple compromised WordPress sites, identified by heuristics like PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs are the primary indicators of compromise, suggesting an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160dcc5dc5855b---ruzopubu.pdf In PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161237cfee9457---21959382105.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/zidufirolebibig.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/lafifike.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/69657493885.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/66832756324.pdfIn PDF document text
    • http://cabin4kids.org/clients/0/05/050cd0fff5f75fdfd14851583cc0de74/File/rejizogumedoxuto.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/60306039349.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/vogesevigitefufif.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/sezunulamikef.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/95b23703a8042c5116dd37b573382842/98656843622.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/litusamu.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/48123532936.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c2def0c6fbd---jupit.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/o5demc6jb6qv9un511mbs0na60/rojeje.pdfIn PDF document text
    • https://motacademy.it/file/79344397873.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607801f7d82dd---87220933136.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/b4osaagg3rs43ghktohep68t7i/sapijif.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/62210115141.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608869d903b92---85434514324.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/39678976873.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/17055833947.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210612_101842.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/g9a1dtvvaheonq0htr4j6e828k/235238016.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=chloride+in+water+pdfPDF 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_off0000dc5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5D 17128 bytes
SHA-256: 7815307110bf746ebac7a0665121dcbd317725a5fecb8f02467b1bba454d5d22
font_01_sfnt_off000108d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D8 10544 bytes
SHA-256: 2602181a61af090484740521dbd24fb2d38edc043723af4b3ad40c0f79c47d42
font_02_sfnt_off000120dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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