Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca70ea78e3129db6…

MALICIOUS

PDF

98.0 KB Created: 2021-07-01 22:07:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: b7568b5793f7a323fe0f555c04184509 SHA-1: d3792d6b666be09b99b1cf65d4d1e5a4ddc1cec6 SHA-256: ca70ea78e3129db6d0a635590ec264e6123fb5fa3a9d321ac7f6490fa1805aaa
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded URLs, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://nomylo.ru/uplcv?utm_term=science+inquiry+skills+worksheets PDF link annotation
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/acqhheuljnbmtfl5n0idcsk1pi/lobofozogipafo.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c959eea73---19654659715.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1608735fee1edb---vofexuvurewekabuwe.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/16f936af5378b0b686cdd151153b0f59/92481885214.pdfIn PDF document text
    • http://goref.ru/files/file/bepuzulefaronozuf.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210626000439_2020523295.pdfIn PDF document text
    • http://healthywithhart.com/res/file/9020358001.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/3afc3748f1bbfe3edceb4535dce251e7/tanewowum.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/fixemo.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/18136774813.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/gabaa786b5s5h02ukbs8kcero9/95623910329.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16073efe3d6387---1303555194.pdfIn PDF document text
    • http://1960whs.com/clients/7/73/73384dfd0d582a2861cf356c55c3c578/File/ravosorarexevuzurefezafe.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/21675084892.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/lduntvc9t680cjcl7e4phvgcqh/50632108047.pdfIn PDF document text
    • http://burmeseburmilla-allevamento.com/userfiles/files/62316229292.pdfIn PDF document text
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/c9a2ee91d66cca6ccf0c2343702b27e6/92395220455.pdfIn PDF document text
    • http://mamam.by/upload/File/file/12156460057.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160970e4deefac---28570279724.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be0d8b91a69---bosibanewomenitozetetonaz.pdfPDF link annotation
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a4247634033---21563659341.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/59515031891.pdfIn PDF document text
    • https://ngonluathan.com/images/ckeditor/files/63119420272.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160830197f139f---zegowen.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_off00011bab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BAB 17088 bytes
SHA-256: 24e9631f0852c30633cf0d0b1b0d2f0192ff3da3e4b155a4512884e363b7e606
font_01_sfnt_off00014830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14830 10780 bytes
SHA-256: 31d6f9bff3352a468eeeb3a77c4ff3420632e77a8486dae29fb16a1960dbb1c5
font_02_sfnt_off00016105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16105 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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