Malicious PDF — malware analysis report

Static analysis result for SHA-256 840f872eebbc538d…

MALICIOUS

PDF

73.5 KB Created: 2021-09-04 19:19:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5b5b7dca026ccd96ab14e0576ecb7298 SHA-1: 5338ad49dcc9678a911a0a3f3c7687b509963c07 SHA-256: 840f872eebbc538d633c080d33658a15088eaf2fd963e5964c8fe7b488031ead
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://philabc.ru/uplcv?utm_term=energy+flow+in+an+ecosystem+worksheet+answers PDF link annotation
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16070441802b79---tapejiwozedozutoz.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/tukinobeniv.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/1db5ec8e1963422275ea56d70b041884/43931774747.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/sukapovikuxeme.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/pitafakizibiwisu.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e82deeff4a---fojav.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad84fd74c43---93046051623.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/logaxuraluvulujig.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/73097317178.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8748dd2ba---febijanokinugizi.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/4faa6749370f11e185742ee18606f318/tuzipobajuv.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/10077972174.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/69387073558.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e88473a544d---50591844700.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/2090becd0a1d221b87a6e9386fb681ac/60231731400.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/sivikuruguwonidijamurilu.pdfIn PDF document text
    • http://ux-school.ru/files/files/14371723659.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/eea65879ee802514bfb7480fe395bc29/40598341657.pdfIn PDF document text
    • https://digireg.se/upload/tunosodipasiweso.pdfIn PDF document text
    • http://wamer.org/userfiles/file/11357086421.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/86d9fb1e147c2aa41fef8cfac83de05c/numuxizenerenarovibo.pdfIn PDF document text
    • http://webspace.mysdam.net/images/newsletter/files/89334423011.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4338820cb6---luseluxugotazupolapiwokir.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_off0000bd19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD19 16240 bytes
SHA-256: e1dc449803deed42d87a2024667424b70e6bf1025bf81f0769fa573e72f0359b
font_01_sfnt_off0000e66e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66E 11060 bytes
SHA-256: fc2b9da9f9d1304138be0c9124de266ebae463d11733daaf1b83f3ec8b9fe8dd
font_02_sfnt_off00010010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10010 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.