Malicious PDF — malware analysis report

Static analysis result for SHA-256 715901d61d6ce6a9…

MALICIOUS

PDF

69.5 KB Created: 2021-10-08 18:02:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 93b0d5cc7c6a37ab7d52c7917d61f2d4 SHA-1: 64b882c2703d2da189713d9ca022908f3b64a04d SHA-256: 715901d61d6ce6a92067a07540c0067075bd61f1dabb866e47898e09cee6d3e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to compromised websites, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple compromised CMS upload links further supports this. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://wastran.ru/uplcv?utm_term=definition+of+simple+linear+regression PDF link annotation
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613016d4d8138---fanoziwi.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/50bf80ba1754de58ab29511a9305ced4/bevolozifutoroseg.pdfIn PDF document text
    • https://rafautama.com/uploads/file/87522475751.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/pilotelogipoxofakibixi.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210918060855.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/16983656511.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/10558138210.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/vunimin.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/sitopozipavofivawaravi.pdfIn PDF document text
    • https://mylin.in/ckeditor/ckfinder/userfiles/files/71269956414.pdfIn PDF document text
    • https://rakbah.healthybitespk.com/alpha/ckfinder/userfiles/files/17787289725.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141025ccb8b2---91506692000.pdfIn PDF document text
    • https://gerbangkuis.com/contents/files/69143007644.pdfIn PDF document text
    • http://caydinhlang.net/userfiles/image/file/pekotoz.pdfIn PDF document text
    • https://ratoempat.com/contents/files/xanemajifezujijelux.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20211005000407_usaefs.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614670b853497---bidufa.pdfIn PDF document text
    • https://childprotectionindia.com/lexcyberia/userfiles/files/mawajeruxox.pdfIn PDF document text
    • https://cli-kh.com/uploads/files/202109041238259428.pdfIn PDF document text
    • https://073741256.com/uploads/files/202110062208409705.pdfIn PDF document text
    • http://rts-3.ru/upload/files/32799413436.pdfIn PDF document text
    • http://uslugi-ogrodnicze.pl/pliki/File/13486729732.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/50359576375.pdfIn PDF document text
    • http://nwhouse.ru/uploads/file/25198842914.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_off0000b37e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB37E 10704 bytes
SHA-256: eb443347e0365ed6a01aaa07b0137e42573733a4ee9d7357b78ce82fdd12a298
font_01_sfnt_off0000cc04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC04 14492 bytes
SHA-256: 262906e764f098492e42d8889ccd9a63b80f489c146c55380aa4c36437e63d9a
font_02_sfnt_off0000efee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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