Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1e1dbd875423844…

MALICIOUS

PDF

74.5 KB Created: 2021-06-08 19:13:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: c7b7991ebd21e634401deada3734212f SHA-1: 4f10f2cbdb002b996249c5ff2e7be947d744d6bd SHA-256: e1e1dbd8754238449efb2bc90b0c2c55dff7ee0fa10ff784cb648c57a36e52ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=physics+class+12+chapter+1+formulas PDF link annotation
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/954ae7720a8b5fc1e45b7f75681f57f7/81430816875.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4ff90b0ee---69704802607.pdfIn PDF document text
    • http://vejwun.cz/images/xikazojakuzowimanet.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/6afc9d68634986a8614c5a177f1d7bef/nutus.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/45385929275.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/ea06e5b8b56805a7b912bd5cd544ddd3/lusalabaluvij.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160be27542cf09---36896523383.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/16972646135.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/77f128e08044480333f193a60a813a68/34824980899.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607455515c25a---sutogowaselulilosupap.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/3df5eeecc2446239b24aa62a25fbdacc/kukibusawufabofagufogibo.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/vj757r5o0f85kmf9jcqdtqn6u3/13447549226.pdfIn PDF document text
    • http://cuacongtrinh.vn/upload/files/11682448265.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5874de80f3---11511131337.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/nv7q6b5qp0q61ggmjk2isf0s3u/nogarivebujad.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/2tgr6lmlmfa5s8bsv9vdln1ou0/pafufagipefarexusixawelu.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/5bf017b8053d613005df58b897909a52/likevokavasor.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/gatadagogazum.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082b05b95c3a---5597123107.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE444 5544 bytes
SHA-256: eff20fbcdd3c4302ebab4ba71dfc8dd379cf31d454de563bcaff56d9c3091aac
font_01_sfnt_off0000f706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF706 11104 bytes
SHA-256: d07ddede177557213d1a34e8ab06f1bc4f5ef3a67ceabffcb30545b51e5857ed