Malicious PDF — malware analysis report

Static analysis result for SHA-256 962918a413f2d37c…

MALICIOUS

PDF

85.1 KB Created: 2021-07-19 16:01:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 359fb7b65cd9beb2a40b72fd1e118317 SHA-1: e39cb5180181daed2cfc48caf7ad830c81a802e8 SHA-256: 962918a413f2d37cf4b5bc2d3a51d53dd579d03ed5b97f909e5ed5de16becf85
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to other PDF files hosted on various domains, many of which appear to be compromised CMS uploads. This pattern is commonly used to obscure the ultimate destination of malicious payloads or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://eatorhours.org/e-bussiness/fckimages/file/zewesaregejududoxawenefar.pdf In PDF document text
    • http://medica-brno.com/files/83177416879.pdfIn PDF document text
    • http://gurukripapublicschool.com/userfiles/file/xasisa.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/5ubh8elp6plg9pij3oimsu8e96/videsusepusibuzu.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/b64a41d8a4a5118850fa4c4a0f6a0f5c/wodokidenezafozaj.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/tubewu.pdfIn PDF document text
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/jowokanesumifagiligizid.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/52af3c99665f71337b46aad1d647e769/2255474620.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/dotokoguniwavi.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/60661225053.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfb3446803---44686147329.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608dafc7be85f---xesigedexirilisexewemukij.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b941e2f01---71189226107.pdfIn PDF document text
    • http://weymouthhighschoolclassof62.com/clients/5/50/50fe23896e84432c97ff20d680692bb9/File/84399639464.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b87ac88a617---nagugikisopaxegojulen.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/73389707486.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/xilejapakil.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/wisapuneduwumepu.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/mubonelekepuwurisidif.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607573d77adba---25509076683.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/turupewir.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/fee90b8b9a5b6d533d56d49d746b822f/biferetozopopujuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=the+virtual+microscope+answersPDF 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_off0000e9e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E3 17160 bytes
SHA-256: d12f4a26be28dc7c0f9edbe378c373c9a1e6ea4d1e170c61702a4916677bfe59
font_01_sfnt_off0001163f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E56 10852 bytes
SHA-256: 4523f89a258718ddf32bffcbd90404a3524d9687212dc550c80e7b0e82a3d154

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