Malicious PDF — malware analysis report

Static analysis result for SHA-256 19da7130199940e1…

MALICIOUS

PDF

72.7 KB Created: 2021-09-01 09:36:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cf211ab27462de1986564ac13bd25495 SHA-1: f37062a255f5fe05f7f2b7b60033564502010137 SHA-256: 19da7130199940e17e8b95fd81ac6bf8cf2a16aaa7f843c9e1178abc760ac273
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to a variety of domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to direct users to external content, consistent with phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://synerhu.ru/uplcv?utm_term=where+was+the+tree+of+knowledge+of+good+and+evil+located PDF link annotation
    • http://jcon-aps.dk/userfiles/file/22348549470.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210709154842.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/87717664341.pdfIn PDF document text
    • https://www.sacict.or.th/ckfinder/userfiles/files/keropafefepitagumomukudor.pdfIn PDF document text
    • https://lotteppta.net/beta/assets/file/29265059200.pdfIn PDF document text
    • https://narimasu-chintai.net/jcfiles/file/xezigumabikitas.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afddbedc695---rufiserewi.pdfIn PDF document text
    • http://dkkarsin.pl/img/upload/files/lebepoj.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/1d862379db5d78f803701de05154a648/85053688795.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/93941240232.pdfIn PDF document text
    • http://superplasticizer.cn/d/files/subuveku.pdfIn PDF document text
    • https://icoachyou.biz/images/ckeditor/files/zunurimoxakekome.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/tafino.pdfIn PDF document text
    • http://concurs-euclid.ro/upload/fck/vupevibawezexemixalek.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/88471245389.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160ccd4b0eb292---49124496035.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/20407939088.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc766b1dad---88170461366.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160721c2a5b2da---4323368839.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/dosunuxobasopipapumirorem.pdfIn PDF document text
    • http://quocteanviet.com/img-chamthi/files/zaxogolib.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ce95eed0a---97507592176.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a11aecb00be---vuwuvomafuzojisivo.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_off0000b683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB683 10992 bytes
SHA-256: 29c2b0aa0d002a65fe83d8f5afd9efdfe8829c62b2a599bf93112e6d2d773993
font_01_sfnt_off0000cfdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e7ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7ED 17336 bytes
SHA-256: 303f55789dc53ad5565b0559e5adb819f6550ca263d3db69f7fd27f6294736cb

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