Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4a5cb553571a58e…

MALICIOUS

PDF

195.8 KB Created: 2021-07-16 04:55:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d2dbec53bff4bec23d4123ca57aae154 SHA-1: 1e44551312e4d37765dab4b9385a5c11f1b18699 SHA-256: c4a5cb553571a58e78a5035551d84fb1bbf6e6e10fbb508651d960bc5db6c61b
126 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites, suggesting it's used to redirect users to malicious content or phishing pages. The PDF's structure and the presence of external links are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9896

Heuristics 5

  • 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.
  • 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://mhspartan79.com/clients/9/97/97d0d0788ec4d6723ba7be3cd58769e3/File/dififipagadom.pdf In PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/40943326457.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a000278b321---jebowe.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/menitezitodo.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609727af6834d---dexoxuxosumepu.pdfIn PDF document text
    • http://valleypainclinic.org/userfiles/file/7313395825.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/nudolufakujesebifono.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/30776292028.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/eb07ec28976c3bce22cc263a52cb870b/34978804090.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a6280d4dc44---xadugesefetoxipepafuroxa.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/4ad549f605a8d30bafbc7d1bd7233743/2543642215.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/dedawuguvulakaxoxox.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606f01cb88e82---98411561567.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/bosasisobaz.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/22060803382.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/18615626554.pdfIn PDF document text
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/galasuvizare.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/b6f9eda99f17c524e75565ad98877c75/zelenipa.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/58782456876.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/1de64094cadf55dc61be77f086864bd0/bijojazetusalubazunofiviw.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/1355dab6b3a997d2b5e234748a56ab4d/lisirolonudufaviwe.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/d2f76765a86e65632b6bc724cf53733a/dosifu.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/41251149142.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4fed35ec4---3148288259.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=when+does+pacquiao+fight+againPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00028687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28687 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00029e99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29E99 19824 bytes
SHA-256: 21c219b063ca44cb0794acdb9795ebf6c456d83f53b0cbde7d8bda4efe1895cb
font_02_sfnt_off0002d23b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D23B 16084 bytes
SHA-256: d11bfa2b02c462a3f9075532ce7ec1132ca3691ccd6a850e0dcf0119a218c04c
font_03_sfnt_off0002e774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E774 10992 bytes
SHA-256: 1c4f6a83836ecaf7c9ae45237b8e69ca660fd79fe7cc88259c8f25326ead655b