Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9ce843d2274ade1…

MALICIOUS

PDF

71.7 KB Created: 2021-09-25 11:42:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6efa7e2987d3a8e6788c54c9f94710df SHA-1: f37e0169552cb7ddb1a6870a3e7f4b5f802a9568 SHA-256: e9ce843d2274ade12d2bc77522cb95bfca1d33fe79e9415a4c0c9a98ce994619
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised websites and disposable hosting domains, likely to distribute phishing content or malware. Although no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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.
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • 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 http://xn--2o2b17g32e8xisqq.com/userData/board/file/felizi.pdf In PDF document text
    • https://manualismedicina.hu/fileok/file/fekuxom.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/32218983364.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614849c1a92da---tulinapeguzinu.pdfIn PDF document text
    • http://cameranichietsu.com/luutru/files/wekidokadapokixefuzi.pdfIn PDF document text
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/71763209481.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/u8g322cl16odur13t07jjrup9s/76407676122.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/92798820441.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/161471a252d66a---larobosefipovazu.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/65957788470.pdfIn PDF document text
    • https://kimcert.org/E/file/10637561201.pdfIn PDF document text
    • https://kultmotor.hu/images/files/57548510818.pdfIn PDF document text
    • http://duplisite.com/userfiles/file/tebafimadojerilolevusuxil.pdfIn PDF document text
    • http://ageddfjtjgrade.pretty-match.com/upload/files/bimusudorodikema.pdfIn PDF document text
    • http://midoriku.zaitakunet.jp/app/webroot/upload_images/files/sokekagosezuruvafuku.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/luvovukapokinatar.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/3848a2a45a1f982374d6c76f5f4d52c6/fefebiluw.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-18/20210918104451689153.pdfIn PDF document text
    • http://talentfuturesservices.com/sharpinstitute/images/files/8657593078.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/31637709607.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613f24ba22d74---10397188692.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/92777326142.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/sebesozitofubarajenojuka.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161301ff31e7ca---lajako.pdfIn PDF document text
    • https://riminabda.sk/userfiles/file/kixatojavupulap.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/kegoxiseramadoxifo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=saw+mm2+valuePDF link annotation
    • 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_off0000b8e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8E1 16420 bytes
SHA-256: 1260431420bd112bb75807a9f39a466d8efb7281e1ca1899a4c3db6c1ce6b164
font_01_sfnt_off0000e292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE292 10032 bytes
SHA-256: 5ec7ae16d51bf51c95434624008688576bdba093c651a672af1894ad0a5d97b4
font_02_sfnt_off0000f906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF906 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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