Malicious PDF — malware analysis report

Static analysis result for SHA-256 18fd643e88523d46…

MALICIOUS

PDF

83.1 KB Created: 2021-09-07 19:47:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3278bc9989af11b784b50adbce632fc7 SHA-1: 224dfbd9027304e57df4b339f617c2e21dcc8aba SHA-256: 18fd643e88523d467181f2124093e066ffbebaecb3decf7ad7babf9ac32ce1ca
156 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. It contains numerous external links, many pointing to compromised WordPress sites, suggesting it functions as a link farm or redirector to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this file is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://laborke.ru/uplcv?utm_term=libros+paralelos+ingles+espa%C3%B1ol+pdf PDF link annotation
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/117c03e6bac521298e39ce84e78ca8a7/63619611356.pdfIn PDF document text
    • https://curtain.jinware.com/upload/files/19838547162.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/a7127613d819ed5a132522b6ff6af8a0/88639514828.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/dutoboje.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac099c8659---zutopukipunofurisekal.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/1ej0fpkrnpb3fr8q80ba4mqcdp/29535536398.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077e6dd95cdb---70036918114.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/woxugolaxap.pdfIn PDF document text
    • https://tantecoccole016.it/file/fanopebisafemilol.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/6687c84af7d2f758e56446fa0977d6cb/vekukowimufa.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/18b649ce4ca3fc5ef1aa3908f698c44f/79190135071.pdfIn PDF document text
    • http://hak-al.com/resimler/files/nogamelejiditoxoluwudik.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/jimopa.pdfIn PDF document text
    • http://onmamtour.com/FileData/ckfinder/files/20210826_7DEE3DB854A12BA6.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/vizawinogujiwerilizubawib.pdfIn PDF document text
    • https://shopabrang.com/images/files/litin.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-6/file/35016500256.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/dibimubakugodineru.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/jipefud.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa693a8634---58654727707.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/3681071c5191395c6d3cdfb3fd87cbe6/39535782001.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1cbc63ed51---211679042.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_off0000d9c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E0 10876 bytes
SHA-256: 6a06f776983606e00bdd1a65417bb2501de2f98a1297eaa6a9999e5d205ea671
font_02_sfnt_off00010a56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A56 19852 bytes
SHA-256: a507b677a4a4e982d7d2ef65ee122cc26159e20707dd9e8e7c58c920f46b519a

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