Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ccd3829de572f24…

MALICIOUS

PDF

76.5 KB Created: 2021-09-05 10:25:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9077490f95f7c5ba66b1b13a0664c9ab SHA-1: 37ff1f22f4813c2c757f8a4933bfe2ac399f9c84 SHA-256: 8ccd3829de572f24b281b4875bdc1440dc30443b64554a127f3b33c48c1e4d4c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised WordPress sites, with numerous URLs pointing to potentially malicious content. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to lure users to external, potentially harmful sites, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/f7utqnrs1re621uvosgtf0qeih/66563978661.pdf In PDF document text
    • http://sevimticaret.net/userfiles/file/bovapazutosa.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/b0cf4a0d9777b5a5bff3baae443dd4d8/8078810927.pdfIn PDF document text
    • http://aminotp.com/upload/files/59727742346.pdfIn PDF document text
    • https://luatkhangthai.vn/upload/fck/file/jirokimexamupobenetojudur.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/441b780b9dd058e1e4eea91273a1ab44/95007257195.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/d7h9ir258loj8bihr0gnubqr05/30750931600.pdfIn PDF document text
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/i7jnkcoh4t45utomjtukg0njuf/23877424786.pdfIn PDF document text
    • http://ncteonline.com/userfiles/file/zemofuralanavixozise.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/a63e6bd2e354740bf31e130e872f4316/jifotujifuxisigener.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16094d683f31af---51940075927.pdfIn PDF document text
    • https://balustrady-metalik.pl/files/93958187278.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/pofibogopigawesuladidip.pdfIn PDF document text
    • http://dalieuht.com/app/webroot/uploads/files/89655787613.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f788488e149---75996158599.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf65dc19d9a---wibazubijewidemafog.pdfIn PDF document text
    • http://nppmaudaha.in/ckfinder/userfiles/files/59997570459.pdfIn PDF document text
    • http://lgassociates.in/uploads/93919072354.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/8c2b6cfbd8bb8d6884d5fb6048f36a1a/litarivapotujofopesor.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/11a8de0b311c6aba5f1b72bfd309aa96/20476816518.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/d6b20030de4a241020afbcbb8f60e36e/lugelago.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=password+protect+pdf+document+adobe+readerPDF 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_off0000c7fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7FA 10972 bytes
SHA-256: a0000a1a16ae883bac47b16bc80ae74b611108b0ef33ae56644885e6c88a46a4
font_01_sfnt_off0000e150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE150 16792 bytes
SHA-256: d7184e27d6853e94ea39b686108fbf42a7ec85dc8ae90455c9452fd33fd5df56
font_02_sfnt_off00010c67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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