Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8bdea163bffc740…

MALICIOUS

PDF

82.0 KB Created: 2021-09-02 18:28:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 79481f68f2ead8520492cad0ade4f6c8 SHA-1: 6197abe0aacb48de26ad11e7dcc4be8f0264fc26 SHA-256: a8bdea163bffc7409ba4346ae6ca2ba26ae6bda1053f534fd46862ac26f62a75
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The embedded JavaScript likely facilitates the redirection to these external sites, which could host phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pjzhengwang.com/upload/file/20210722_010310_158.pdf In PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/bp50q8i0os9jl1torojgrf14b9/kolojofedebusomura.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/bgk8op898gjqi0gcj49pt7ods4/67007217996.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081fe41f27d2---24048671360.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/a948698c9a55994744d50e83b0810848/66780169635.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/26606618796.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/22921869236.pdfIn PDF document text
    • https://beliangka.com/contents//files/62035878624.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/55286395232.pdfIn PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/letufawaletokok.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/piwogilegawi.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/hmfbeteeqjr11dsmut3ghgh2tn/95392692537.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606fca7b6c4d3---48317122053.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/rezoxuretowejabapusavavi.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/tewijaxuwow.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16075713dbcd39---nomegenatetufo.pdfIn PDF document text
    • http://zonwering-nederland.nl/ckfinder/userfiles/files/40899038448.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/vitexer.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/zovirab.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16078e1ae27239---89552874217.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/kebegoko.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/44551448007.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=cashless+society+thailand+pdfPDF 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_off0000dc0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0B 10760 bytes
SHA-256: 8f7adf167ff583b439e376ff93d655b8d67890c5939456ce1e62db58f295f467
font_01_sfnt_off0000f4c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C1 17412 bytes
SHA-256: 09fdc734160574aa5a3815818688d0b054bdc6fdc74b2162779d213aa2a9acd5
font_02_sfnt_off0001222f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1222F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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