Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae72486e3dc09ef9…

MALICIOUS

PDF

81.0 KB Created: 2021-09-20 23:44:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e1b11e6ac52287058aba5a6277cea47e SHA-1: 2608e90f73299d4be0312305342741a8a592cc85 SHA-256: ae72486e3dc09ef92ede011c6994865c91a571333da774bf8bd5e58ceb3aa0cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to lead users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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://oniceh.ru/uplcv?utm_term=download+game+free+fire+ppsspp+android PDF link annotation
    • http://111-orte.com/testarea/cwsCMSlight/media/files/21461523929.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/bilijodonul.pdfIn PDF document text
    • https://diphong.com/uploads/50234501530.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/15926142333.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/pubagazupa.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/lodl5p3erdett3mgoen0enuubt/lekafujagolikubixik.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/40369632494.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/70158945076.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/tekimejew.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/a3fe667f010d6d166fce928d67dcb441/xegawefedipepebo.pdfIn PDF document text
    • http://hamzalegalservices.com/userfiles/file/52733111508.pdfIn PDF document text
    • http://a-pluset.com/userfiles/90493243759.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/2da41c69a4fb8f5d398e6abaa9cdd70a/dokumekamilizese.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/c3c678dcd76f4b9674616e16f29f47c8/5625362705.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/44743363389.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/pumerixowuziwet.pdfIn PDF document text
    • http://muasamhangmy.com/ckfinder/userfiles/files/porekakesavanevup.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/33sguj5451u6i6j2b68djpp0m5/99717533330.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed71317312---vixodawevur.pdfIn PDF document text
    • http://seamacros.com/upload/file/botamix.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/emeqqun1saa6j14roc3ggpmvcn/76831553673.pdfIn PDF document text
    • http://millecolori.it/images/file/3649757587.pdfIn PDF document text
    • http://kawana.tech/userfiles/file/wemejavapepo.pdfIn PDF document text
    • https://vwb.mrv-educationservices.com/content_file/files/bekeloweka.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_off0000cfc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC7 20284 bytes
SHA-256: cd2e5c38ab22890b90836272ca38b873d102db5f18a038847b0fa2cad06d7091
font_01_sfnt_off000105d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011df0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF0 10828 bytes
SHA-256: 07fc407e4e763f3f79ffab6b23a2d4d766d012c3dbf0ae73240e7869a83cce6d

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