Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cc571bf598b8e86…

MALICIOUS

PDF

85.9 KB Created: 2021-07-07 09:52:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1702ec30c40c9a03bc1e39a45e04b9cd SHA-1: 5b266822020739c7d4c6daa98c5c62791790fa20 SHA-256: 7cc571bf598b8e86f4851c98419a6dbf2f06a1029eda034a22bf5183ca942ced
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://crysiq.ru/uplcv?utm_term=my+favourite+pet+essay+for+class+1 PDF link annotation
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077173453eb7---midapulibov.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c40ce73e2---57280578917.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/lukomakuxunajidafun.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/faxaxezeriri.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/80238347405.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/titotebodedusapunoxanuzop.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/pizizagororoj.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/c087aaeb2244197feb70ac3ee5a0b0cd/528417049.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d7723f3756b---kupigadefilibaxam.pdfIn PDF document text
    • http://sammyuriasproperties.com/userfiles/files/87173154579.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/40668008793.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/615899c65596502c5c3050152bced80a/rerevarorekudijunuliri.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/retalosapi.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/u015bq2s4hh5734htr0b3hj7mg/42661326364.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/7992201615.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a59b1230c8d---21655609414.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/revotijuxiwagere.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/d0b80d13ae03041f539493926f9802b8/juxazofexapotogade.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609511a653ac6---54606934954.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/83161340472.pdfIn PDF document text
    • http://vietsinphar.com/uploads/files/kapolemaxuruwo.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782beb81947---21679588345.pdfIn PDF document text
    • http://crm333.com/documentos/file/fifesopujilosi.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_off0000ef39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001074b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074B 16544 bytes
SHA-256: 2ef227730954bc0d2ffad4f579b43f711ddebc6a8d3d2b7b9e0826578f5e247c
font_02_sfnt_off00013192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13192 10696 bytes
SHA-256: e17398d3292cd218a1580b203be86f46e7630311ad23bf3e5d0e2d24ab546f04

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