Malicious PDF — malware analysis report

Static analysis result for SHA-256 99f60cb2b87b8cf1…

MALICIOUS

PDF

84.3 KB Created: 2021-09-03 22:13:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d8551eaa6340962890702f856a60d035 SHA-1: dde094de85de2abf39ef6ff4d64d4ca15cf9a1b6 SHA-256: 99f60cb2b87b8cf1bb7ae87da4dc1d873cb97cd3cbdfcaff2ef80d31134035eb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites acting as link farms. These links likely serve as a lure to download additional malicious content, as indicated by the ClamAV detection and ML classifier. The primary attack vector appears to be spearphishing, with the PDF acting as the attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pistant.ru/uplcv?utm_term=network+security+interview+questions+pdf PDF link annotation
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8983bf971---61631866045.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/dozuzite.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/76475122951.pdfIn PDF document text
    • http://www.celso.org/download/69825414378.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611705c0df0cc---96960834600.pdfIn PDF document text
    • http://francisfamilyreunion.net/clients/870293/File/wikaretode.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/4597174458.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc479d9d89---zimafutosirebonew.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab88d76b013---fekafenulevoselivuwuja.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/37fc0571e680e75dd0a63f6dba4b3bd8/bazinamijoxufukaw.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/funifomusowisawid.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/55996041740.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/6e60bfc199ec76d7de4815e7fdf9787c/luxefusipekikofetis.pdfIn PDF document text
    • http://tucsokszekszard.hu/images/news/file/73309312181.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/m9qvb57bofm4tdl93v4nq9aivp/jabibunejotisejamutaj.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/9554a84e0acd1db5cdf64234fa4687b7/rilikilabaxodusipe.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/lokawevorilonif.pdfIn PDF document text
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/77614614688.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/xizixixafi.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8555e59adf---81897302441.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/42817091925.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/julemotuxolotopipog.pdfIn PDF document text
    • http://verdantnorwich.com/clients/3/30/306756bb587dffcd11ca74610d845a16/File/getiri.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/bijpr9m1frj66bmadsh24fcvci/72436728104.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_off0000e58d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9F 17300 bytes
SHA-256: 47f81657d34d4c2a8740cb83bb938317418364da4e511323fe69c117ba683cc5
font_02_sfnt_off00012a34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A34 10988 bytes
SHA-256: 6838dca7c829bbdf0ad8ce493e619567c5becc296f5c3b99e828a8e2610e72d5

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