Malicious PDF — malware analysis report

Static analysis result for SHA-256 d113f912cdc1778b…

MALICIOUS

PDF

80.8 KB Created: 2021-09-10 07:34:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: cc7e2aeeec6c01e7167a0e3ce7985db7 SHA-1: 4ced05bac4f2416d1e8ee6e8c356966036afbaa6 SHA-256: d113f912cdc1778b4d76cd629ee036772db28b0471da7a0bbb7541a7d649341d
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure suggest it could be used to exploit vulnerabilities or redirect users to malicious sites, potentially involving JavaScript execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://alpasol.e-giant.net/upload/files/92950765481.pdf In PDF document text
    • http://sampoernastrategic.com/uploads/image/files/21776596749.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/d9eca6765bfd5a4022e8407b4fa87298/74777949849.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16130834625eb0---24738771926.pdfIn PDF document text
    • http://www.beverburcht.nl/upload/files/roruse.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c723ef56a---29686641436.pdfIn PDF document text
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/43470755881.pdfIn PDF document text
    • http://fotossc.pl/_files/file/34434702336.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/file/puganumibonamanoko.pdfIn PDF document text
    • https://vnjhanoi.com/upload/files/53245986519.pdfIn PDF document text
    • http://blccy.com/userfiles/files/toxed.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/rezirolusowexurevuto.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/d9eaec1ee063e69acfc6a3f74ed6a233/safukevim.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b5fdcf6a9---mifunakaxotivibiz.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/zelamaxi.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/reseregupoposupibig.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305bcd56aad---veduvosevizodowu.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/kerub.pdfIn PDF document text
    • https://epiphanych.com/images/file/25131546718.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/weponubuvegiwevi.pdfIn PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93379741891.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a8955b15c2---77225724189.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/66052923656.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=game+killer+pro+apk+downloadPDF 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_off0000d851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD851 17460 bytes
SHA-256: 9adcfd3d4b2c07a21c8d8995e77f2af90970c4b7659b6758b0a54f20fd605702
font_01_sfnt_off00010584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10584 10504 bytes
SHA-256: 5e3f5c0c8412484a96fd107b47b489302a5774dc545a2c0cdf030c07418048dd
font_02_sfnt_off00011d58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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