Malicious PDF — malware analysis report

Static analysis result for SHA-256 028ce716295fec16…

MALICIOUS

PDF

83.2 KB Created: 2021-09-19 02:42:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 70406f69c56c525cf6a672043b1518a9 SHA-1: 3f33b21a6ce7d6fe66b29aa6d927154c39313ea6 SHA-256: 028ce716295fec16d67e7df4c692ab65d495d398c08cf6cc339b2fb8b86758a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs that point to various websites, many of which are hosted on compromised CMS platforms or disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, likely to manipulate search engine results or distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing or trojan PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://drafthe.ru/uplcv?utm_term=dictionary+words+beginning+with+c PDF link annotation
    • http://indigobaby.eu/upload/files/guniradifajubiletafar.pdfIn PDF document text
    • https://cvzona.lt/resources/img/files/bodoxulafijekesam.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/161301693dba00---83179075967.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/21099191207.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/tidefajanafibiwa.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/60968058942.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/9a8d8f7c4a7f10af4329609c18dfe368/virubakolino.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16135d69bd5d4a---pudoz.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/60547730483.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/37151271325.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/mafek.pdfIn PDF document text
    • http://medi-sen.com/files/files/66059333706.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/0824b5cb40893339bd8aedc70afc7bb4/97855698943.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/jamonepofidevuvojetexu.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/13645634230.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/zagalelejakap.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/91824618056.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/wofes.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/25300795003.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/kukirugowosupazawozeteli.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/zokeruwomuvagazozepoj.pdfIn PDF document text
    • http://xenangheli.vn/public/files/xuwanifisoxibenoraxa.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/kupinubunim.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/49414377179.pdfIn 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://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_off0000de87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE87 18384 bytes
SHA-256: f13993baa0d7aedf9337b9bd6bf83a3909621288ff441cc70c7f1808774df01d
font_01_sfnt_off00010df5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF5 10944 bytes
SHA-256: d640a53e6fb73f7f8d6bf0a6c081b240d3a085edb8a666b19ed17b5cd23eb5e6
font_02_sfnt_off00012737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12737 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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