Malicious PDF — malware analysis report

Static analysis result for SHA-256 d04ae56cd215c2c3…

MALICIOUS

PDF

80.2 KB Created: 2021-09-08 05:04:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: af21ae39f9271b4946c068f081d126f2 SHA-1: 3970b181b98ee1c1c1ba1be922e4315027054efa SHA-256: d04ae56cd215c2c353fd2777fe249fbc511d4cfbee982a69d4bcef2d3d946d6c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Numerous heuristics indicate the PDF is a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it is designed to exploit vulnerabilities or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://infrive.ru/uplcv?utm_term=this+that+these+those+worksheet+for+grade+1 PDF link annotation
    • http://polymer-optix.de/userfiles/file/rugiwuwureka.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/vozuledizigimis.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bf4790b8b74---zaxes.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/xipagezevatigefekigisap.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/0a02ed1e538833356afe1f4aae4c8024/93171279886.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608adb4f80795---72160999921.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071cac51e3f2---sizonan.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/26314318087.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/7162b60ee58df22c66c89dfebed5c959/netupaguwuputajipoxinebig.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/uumnh9r1t0un0eq3k9jfrdd2v4/vikutifotadoviwubafum.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/44234597411.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0c5b271b1---3530025478.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/e48e133a6a34c4a9cda5f16d16f46023/zabosalifit.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161218e294e2ac---juvajox.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/50416553292.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/46547971540.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/60740947700.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb065f8e154---loxunesamulubamijimo.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45186236162.pdfIn PDF document text
    • https://groupunsur3.com/contents//files/jixoxonejofuwitalujes.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/vizuvipi.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/mojf6d5kv15ioed41fvm4hkhpv/monovilorudap.pdfIn PDF document text
    • http://engcaphone.com/_UploadFile/Images/file/tolepekuduvizefeforu.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_off0000d58a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58A 17620 bytes
SHA-256: fac09ed345300fe6a7051f32b82153d321cf5d841332ca60f092600a1942858f
font_01_sfnt_off0001027f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A96 10676 bytes
SHA-256: d2ff34222d392ff7c4fb80a76a2fa64865195588e8d8f053599da6da82f4c042

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