Malicious PDF — malware analysis report

Static analysis result for SHA-256 f43c25f4effb6e9c…

MALICIOUS

PDF

73.0 KB Created: 2021-09-12 17:26:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f570575b055b779f18aa7b2fbb27ab44 SHA-1: 0957d24613d2f3b38554a35d9a97fe507a0fcca9 SHA-256: f43c25f4effb6e9c597c274aefc196b3a51832ee2dfb981e69c4906f83c2e601
184 Risk Score

Malware Insights

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

This PDF document contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites or disposable hosting. The presence of PDF_JS and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, along with ClamAV detection as Pdf.Phishing.Trojan, strongly suggests a phishing or malware distribution campaign. The embedded JavaScript likely facilitates the redirection to malicious sites or the execution of further malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://pixomot.ru/uplcv?utm_term=miui+12+redmi+note+7+ota PDF link annotation
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nixegiwikukikufawek.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/3281930649.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613033af29464---50783818794.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/b3c35f1bdc1fcbcc56a58965a03ceef1/42782590269.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/66699843945.pdfIn PDF document text
    • https://www.barefoothoa.com/webroot/js/ckfinder/userfiles/files/35013720890.pdfIn PDF document text
    • http://artc-polymers.com/upload/images/files/467828589.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/8823180859.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/50578345221.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/nuzeluzosemulomorari.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/42859905840.pdfIn PDF document text
    • https://valgott.com/images/userfiles/file/76152933479.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae335b30c4---71837156605.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/mawizej.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/23747141464.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-1/20210901225910201508.pdfIn PDF document text
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/15322563202.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/tozosix.pdfIn PDF document text
    • http://sdes.in/uploads/fubejuki.pdfIn PDF document text
    • http://geomanteia.com/userfiles/files/bitofetinanive.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/56420134979.pdfIn PDF document text
    • https://magicdiscoradio.com/userfiles/file/65510387717.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/kexibiriso.pdfIn PDF document text
    • http://navrattan.co/userfiles/file/79540833132.pdfIn PDF document text
    • http://dgxzz.com/uploadfile/file/72786930086.pdfIn PDF document text
    • http://epmachine.ru/d/files/12559094805.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_off0000bd5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD573 10512 bytes
SHA-256: 173214e6369568c321660ea7e8324f99c7259492bc9112fe9a25cc3dcebc314b
font_02_sfnt_off0000ed71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED71 15952 bytes
SHA-256: 7036077897ee9b27b72c8bc0d9086609585692681e784a32dfdc65a1e718ae8b

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