Malicious PDF — malware analysis report

Static analysis result for SHA-256 674c0bf1720e9ba2…

MALICIOUS

PDF

82.0 KB Created: 2021-09-13 17:45:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ca2870534092196bce392f76dd417384 SHA-1: 41782a57198160920cc760e2e0e5d6b853e5f994 SHA-256: 674c0bf1720e9ba2fb0582185d9ca674205f144ec171c3fe0c6ff98b607f84ba
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are flagged as being hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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.
  • 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 http://5mal4.de/moneyvidya/web/images/userfiles/file/tobobopomisofopazavowis.pdf In PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/sotadalaxexakot.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/ledusegaxajuvilamu.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613920adb6390---jileja.pdfIn PDF document text
    • http://hainfelderteich.at/30713167825.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/55377491387.pdfIn PDF document text
    • http://gavionescodeinsa.com/userfiles/wuzerazarigavefam.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/zawobed.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/dizugemigomedo.pdfIn PDF document text
    • https://ienter.bg/files/kimejekisaxaredazadamuwin.pdfIn PDF document text
    • http://ossokahve.com/upload/file/46249129767.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/jerukusifudafu.pdfIn PDF document text
    • http://twilaw.com/files/files/woson.pdfIn PDF document text
    • http://macierz-grodziec.org/files/file/61438957656.pdfIn PDF document text
    • https://xtremefitksa.com/ckfinder/userfiles/files/kigavum.pdfIn PDF document text
    • https://abbma.in/admin/uploads/file/63155062496.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/12005005559.pdfIn PDF document text
    • http://myoffice2561.sesao33.net/UserFiles/File/dafekoxeturuzaje.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/62346706707.pdfIn PDF document text
    • https://wecareprogram.org/images/file/kiwur.pdfIn PDF document text
    • http://shopabrang.com/images/files/97508035430.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133448fa9595---68058133174.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/wirarokujilijopu.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210906034644.pdfIn PDF document text
    • https://advik.net/userfiles/file/80255705679.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16138d10e97ed3---2377419313.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=bmx+bike+race+mod+apkPDF link annotation
    • 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_off0000dbd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD7 17860 bytes
SHA-256: 9bcfe09e07c64f1d93350674ab1f0b70b46d14817d541023fdf1522a3be84f19
font_01_sfnt_off000109da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DA 10644 bytes
SHA-256: 13f1861cf7b85d1b90adb90fba393c008db80681e2639fee32753a85813078fc
font_02_sfnt_off00012208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12208 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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