Malicious PDF — malware analysis report

Static analysis result for SHA-256 52fc34eed98b7e72…

MALICIOUS

PDF

74.2 KB Created: 2021-09-21 03:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ed2c725d2097e1c7e5b6ee944f7cf7fb SHA-1: 391d2e671693abf2b7f630751da8a5494e92bb98 SHA-256: 52fc34eed98b7e729edc3eacf303243f44bc9f1d0536f3660e245dc2e367c4bf
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, a common technique for malicious PDFs to execute code. The heuristics indicate the PDF acts as a link farm, directing users to various external URLs, some hosted on compromised WordPress sites. These URLs likely lead to phishing pages or further malware downloads, aligning with the ClamAV detection of Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://synerhu.ru/uplcv?utm_term=john+eckhardt+free+pdf PDF link annotation
    • https://cpc-serbia.org/js/files/10806750100.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/161414d7690c7c---saforulipewut.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/41982572093.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/31750573201.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/fugunubevadatigixanen.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/dalufa.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/wimuretetidoxifofeven.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff6c8c6f73---85752395008.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/7580291783.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a85892e64c---95069416498.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/58038846859.pdfIn PDF document text
    • http://446888.top/userfiles/file/zutidupo.pdfIn PDF document text
    • https://jagamimpi.org/contents/files/dufunal.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/67008567770.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/fifibokawuwavonajifuriv.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/51190679345.pdfIn PDF document text
    • https://rsvforum.com/userfiles/file/14393454117.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161425da79e363---44588054252.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/wapibujizejatex.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/xipiwuwiwitimawixa.pdfIn PDF document text
    • http://tuecpa.com/file_media/file_image/file/39858521583.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/174af14f0baea9458e1e51d373092cdf/xumezema.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/bevixoxopugi.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_off0000c0ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0CA 16660 bytes
SHA-256: 7ba596d4321c0d91ca4dd177d111d75be160a4fd75683e5131fab6152381247a
font_01_sfnt_off0000ebcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E4 10492 bytes
SHA-256: 3365dfcdd1aac35300989d3f8391768932cae547d66820a5d79c2a0c9b48afaa

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