Malicious PDF — malware analysis report

Static analysis result for SHA-256 58fc0c6c93201e67…

MALICIOUS

PDF

122.7 KB Created: 2021-06-30 12:01:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 54ad2369c7a2b43ea4e49348629687c6 SHA-1: c47e8ddcf34c582515e45513b3b10f6dd1be144b SHA-256: 58fc0c6c93201e676fee5b2a4dacba2a9b7320cc930f2b751146ba6800f75c37
156 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 reveal it functions as a link farm, directing users to multiple compromised CMS upload locations, including WordPress sites. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or redirection scheme designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/41k94d2ej889r10f6bpmo97ns5/sikusinagemela.pdf In PDF document text
    • http://studiobaldizzone.com/userfiles/files/22702284887.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/fh5m9gchddr44t7sr8v4pl3ts6/bojirob.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ec44867eb---zonobalupeg.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/tuwabirojolopemoj.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/mslcu6crd5inam6ci6sg3ivoga/82957494427.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/68420007937.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d350822b0d---59623846588.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/giwebotefugekeg.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/wajuza.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/d2b5ac564343607c47bda5c67bd62917/39403053781.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/5232a3c43251e53945fcfb895ab1808c/faponuwes.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8e903670a---80943909376.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/v82u5a7a03tmqlcrpa5p1ogvu2/4343311757.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160740257b0bee---19433930748.pdfIn PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/2de63e6f392c8b435e1660d419f541eb/6203923938.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/b4b35kso0nnkf8v9501pnouvil/34141769606.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/160971476740ea---10745595478.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/87607252846.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/lapewefipafusafep.pdfIn PDF document text
    • http://slsnn.ru/content/files/67196552227.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/5bd6d88870b5616e81d21a30104886cd/36104881145.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/49484485696.pdfIn PDF document text
    • http://deborahbrown.us/clients/860103/File/wakaro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=quotes+about+touching+the+skyPDF 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_off00017d02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00019514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19514 17752 bytes
SHA-256: 865c5d114515766fbe9aade512bd396e2913fff739a09d0ae090b487050a48f1
font_02_sfnt_off0001c3a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C3A8 10868 bytes
SHA-256: e5738599747681bfad2e4a1b64b697c4ef3cea7504d0fd58b9844c8d8e519cab

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