Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f2314e619a42e9e…

MALICIOUS

PDF

97.1 KB Created: 2021-08-12 13:11:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 354ed42301bf45dbce9de71a562569c2 SHA-1: b0ae3e8a3398c688fab769bc0a87b36b8e74ed89 SHA-256: 8f2314e619a42e9ebdbda0aa666422397649048b0dc3df452ca584e3f2975637
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, likely serving as a lure for users to click on the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://119hero.kr/userData/board/file/85705565146.pdf In PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/81164d56d5931b79ce0c9b644d9a7da8/bosowujob.pdfIn PDF document text
    • http://juha.be/_files/file/38981473870.pdfIn PDF document text
    • http://peak-experience-japan.com/vavezalesavu.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/12665208568.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/pedatiketijelak.pdfIn PDF document text
    • http://cartopack.be/Images/file/41269911907.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc63fb0e92a---mebisarix.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080bb93de3f9---42133242292.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/lamisejo.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aa36f0466d8---vavalisisasumokizefogurej.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/nawuzawinuw.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/835f1a9f5c19d17fec095e9b3e8052ec/viwububeninibipibig.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c16e3d5a84d---rutuvinunodu.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/9919404609fe000674058585e98156fa/xufiju.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/9c37c2c3d6048df8b7e125166e13e2b0/bonivifowevukoju.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/59134051153.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/26876574358.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b171e5cf4e9---liwufenavizarukizasone.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b661cebd3f---duvutebegekebinov.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/d3cfe072b8cabf5121add8793d55b95b/75634194496.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/82275c20ebfa6c8386635395b3b9f9ae/12762811358.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/o3efctsqf7st5vi6pr9v7j83nq/46351444781.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/xareligarugo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=food+calorie+chart+pdf+philippinesPDF 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_off00011724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11724 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012f3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F3B 10692 bytes
SHA-256: 440bb412a9e344a8e6e493cb3adae39a38439f6d61fd4f5166fd9b1c47848fb2
font_02_sfnt_off0001479f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1479F 17780 bytes
SHA-256: 2c24ce222cbf8953de8f2e0a0e7e72f2980daf9c1df79fddb3f9701f9502fcb9

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