Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9a460ae920d7cb0…

MALICIOUS

PDF

83.0 KB Created: 2021-10-08 12:46:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 931a76b4ed722094eda3addd28b4fb1c SHA-1: a67e55b5018f001ca1fe7cb143f3b694c35d3e68 SHA-256: e9a460ae920d7cb0147cc887da37047286d476f33912d6bee365431a461da851
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript, which is a common technique for delivering malicious content. The heuristics indicate it is part of a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to distribute phishing or malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://philabc.ru/uplcv?utm_term=ghd+live+streaming PDF link annotation
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161395e90d5ccf---ruxurebuwaminexeno.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/51985446918.pdfIn PDF document text
    • https://magnettoptan.com/upload/ckfinder/files/45561360729.pdfIn PDF document text
    • http://esistore.lu/userfiles/file/gidulezojasadow.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/rusijezubimixabi.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/649174da0d2a9bb89e4436223a8da231/44149539862.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/bexakopemegumin.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/54164420807.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161540854675f7---82845065576.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/86186769145.pdfIn PDF document text
    • http://turksebruiloften.nl/userfiles/file/47136052659.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/wufojoxosape.pdfIn PDF document text
    • http://marketingnews.fr/images/file/10053525869.pdfIn PDF document text
    • http://camelliafb.com/uploads/files/202109061517271416.pdfIn PDF document text
    • http://tech-sub.com/userfiles/file/89251979638.pdfIn PDF document text
    • http://autothudo.vn/upload/fck/file/melabuxu.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/80370926304.pdfIn PDF document text
    • https://shidoremicrosys.com/media/penujojedemigomudiba.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1615930e10be78---66231862052.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/obkgucd8m18gch62gir264a99g/megubofuvizifojef.pdfIn PDF document text
    • http://gamaxmotor.cz/data/dokumenty/51001069958.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/0hel19fg38ofhg4eh0r4nrh5u2/29134686748.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132452653589---gojizemi.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/36754064964.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/2021107201203245.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/7381216354.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_off0000df6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6A 10680 bytes
SHA-256: dbeeb6602ffd2f8f374abc4a1951a827f4d23dea2e2b75ecff871d4cc77c5258
font_01_sfnt_off0000f787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF787 18272 bytes
SHA-256: 0c078d9ad4b953e457124016af70c0fae6f11a43489c35c66041b45b3f968208
font_02_sfnt_off000126ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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