Malicious PDF — malware analysis report

Static analysis result for SHA-256 97b0dbb7eb75de86…

MALICIOUS

PDF

69.2 KB Created: 2021-08-31 05:36:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 97c968d7a55ec35baaf8fc822fad8c8f SHA-1: d5254f62206ae95e1e14a44fba817ed72699fabf SHA-256: 97b0dbb7eb75de867db7f0422dc47986b3a1150aecf8d44b0629b90233d94333
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document is identified as malicious by multiple heuristics and a machine learning classifier, indicating a high likelihood of malicious intent. The PDF_IMAGE_LURE heuristic suggests it's an image-only document designed to trick users into clicking embedded links, which is a common phishing tactic. The numerous embedded URLs pointing to various domains, some associated with compromised CMS uploads, further support this. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggests it's used to deliver a malicious payload or redirect users to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://catamma.ru/uplcv?utm_term=protein+to+mrna PDF link annotation
    • http://fkjz.cn/upload/files/2021/07/202107201552222643.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/moziguxaposovefukufuror.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/73cdc33a2ff537d61469f0956477cebe/67436133881.pdfIn PDF document text
    • http://skyline64reunion.com/clients/e/ec/ec378541aa9b73e2b99de5ca5545ec21/File/79500111948.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/863852d4b84c4635115e543b8da78f10/bujuxewubidoxipit.pdfIn PDF document text
    • https://cosmopolitanhotel.eu/uploads/wysiwyg/files/zirujilijiderinitujezeb.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084aef4b733b---61799823687.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/wadurimolijufuvifurefaj.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b63501dd633---xegonef.pdfIn PDF document text
    • https://rpitrade.com/ckfinder/userfiles/files/72066290202.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/guvipudinitaj.pdfIn PDF document text
    • http://gistfamilyreunion.com/clients/8/8c/8cbf0a40baaab9dd4734ff2cdbb1e120/File/77392797914.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/85047454015.pdfIn PDF document text
    • http://richfield1962.com/clients/4/47/47516dc9824f3897220912ef171c404f/File/sedisot.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b27692925---sigesobuzolikogo.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/9914487425.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/riwedodu.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/k56rgnogtcn640leljjvsrkhc3/87730031975.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/redoxarakepara.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/bofow.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/garuzupab.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/kasemibi.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/47223689836.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_off0000b510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB510 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD27 10056 bytes
SHA-256: dfe614278943ad3ed3c3a2f6dd87704b9807cca1507d3ebe9512f4c864a1e534
font_02_sfnt_off0000e373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE373 13892 bytes
SHA-256: 57690a140eb1d8cbf3909dc88c6e73de47d0bc963d9b5445f6cf067e5f567c71

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