Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5fdbbacbf8a47e5…

MALICIOUS

PDF

85.9 KB Created: 2021-08-17 06:24:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dc75ff240f5cfe46351738c1f0d880a7 SHA-1: f2fc1805cbeb81251693c622fb396c78ceff31b5 SHA-256: d5fdbbacbf8a47e54cf150cd1d426202e36f20eaeb9211f132d8cebdc08fc0aa
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed for redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://tsnpharma.com/upload/files/barizezuximovibesasunaxaw.pdf In PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb20e749542---kefazowilexok.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/buvipexodewajigekowovuvo.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/74130059778.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/39137547003.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/jhdrcdkg0jlo3sd1k27d55u28k/13725203604.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/sixajutebujiwesofemog.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/1b57315f93cad83dba333cf9d8eda218/4581971842.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/083e1q75ib046hgnqgcd0t2517/defapivexotenojijegazexej.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/22182943594.pdfIn PDF document text
    • http://instandee.com/Images_upload/files/4167128517.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/24351535536.pdfIn PDF document text
    • http://cloverpark1959.com/clients/51168/File/dokisagiwizuriletudimeve.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/zimafojegu.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/pavateze.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/nisezanebeni.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f85e847f1---20103664512.pdfIn PDF document text
    • https://avflash.nl/upload/files/pizixinafufexudux.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d38a5faec29---vofefugisulasimebutugubox.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/xegomoru.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/xobib.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160d6519c81d84---87868402918.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=who+are+the+minor+characters+in+romeo+and+julietPDF 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_off0000ec7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10492 10860 bytes
SHA-256: ba9dfa8c7a0fc63709713c800b9cb6d45227e27fbd830f8f4c58b45b2b3052dd
font_02_sfnt_off00011d6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6F 16820 bytes
SHA-256: ed240c5f8d92e0777d3754aea016c02482c18f6f78373fa94f6754d0cbccd9cd

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