Malicious PDF — malware analysis report

Static analysis result for SHA-256 929f05d000cf4a0e…

MALICIOUS

PDF

84.3 KB Created: 2021-09-03 11:19:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c22f8a7fbd6460a1e5ef524f1f0362cc SHA-1: 84e45bd23d88011f35c450795729764f258a9eb0 SHA-256: 929f05d000cf4a0e2f9fbfaf3de5be9990b659332a0dd8f6e18d87465eb103c0
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics indicate the presence of embedded JavaScript and a link farm hosted on compromised CMS uploads, suggesting it's designed to redirect users to malicious content or download further payloads. The primary attack pattern involves using a link farm to obscure the ultimate destination, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50798490502.pdf In PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089f6f8eaa46---zonaxozexofevaxil.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/ruxuloruxokogat.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783ac280046---75062257705.pdfIn PDF document text
    • https://atl-50.com/files/file/99656102656.pdfIn PDF document text
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/tiwevur.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/83391533853.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/mufizuzinepikuru.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/3u7017hchtpj58dq5keqfc34l2/bowil.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/fajofoxagivebedivasesenug.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/1392665955.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/mamonufopojudokoku.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/o48cig60id55iudod7g2enacrh/33522790211.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/5153648073.pdfIn PDF document text
    • https://martabaktelor.com/contents//files/tevolapipaja.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/56112674674.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/70644621506.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/a80f0aac3524e27bb5ac7ab4a845cdc5/rugizixirod.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fac07c9ceb---55336072931.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/1333207109.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/9d1386054d4257b194a8dc667673a299/kagodonisidutibuzigavesuj.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160ddde81a3859---33621499950.pdfIn PDF document text
    • https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/23410050543.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/wakitamif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=toefl+itp+level+1+practice+tests+volume+1+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_off0000dea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA8 10856 bytes
SHA-256: 1015a653066d55120c0841647510040d14cc991f8ad09f76aa4f793a0fa928e8
font_01_sfnt_off0000f7df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF1 19588 bytes
SHA-256: 82c5b4ffd36a3c6938c0adff0a74085be37a3df6a615d438b48da485970443d9

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