Malicious PDF — malware analysis report

Static analysis result for SHA-256 24c05ba759434d6a…

MALICIOUS

PDF

95.3 KB Created: 2021-09-12 02:11:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d752df1e52321469bbb308e82e05e66d SHA-1: 431d2e6c3ff928d2595668118342ed6be22b1920 SHA-256: 24c05ba759434d6a4c27ca8f45f95f9a1305762d4538266f0aea73e158758917
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://uptownchantilly.com/uploads/files/21243474212.pdf In PDF document text
    • http://liebherr-tr.com/userfiles/file/3617445833.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/vugerobatasokemi.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/e12eikgq4ppbblghe2tm250063/13108902641.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/731733c72329bbe05a80f2f32e38d793/6625790318.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/kexifikam.pdfIn PDF document text
    • https://asfus.net/virgsurv/userfiles/file/27955122881.pdfIn PDF document text
    • http://pk-rowery.pl/user_pict/file/tamuxebatoxoluwupori.pdfIn PDF document text
    • http://longbienco.com/js/ckfinder/userfiles/files/94429089144.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/64239022789.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/62526285440.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/39081282414.pdfIn PDF document text
    • https://peterdegendt.be/file/banizufamaja.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/ridununilogemaronuxix.pdfIn PDF document text
    • http://www.rajpuc.pl/pics/file/65133385691.pdfIn PDF document text
    • http://healthywithhart.com/res/file/nijatedakuzavusuzalexuru.pdfIn PDF document text
    • https://pmms-online.com/assets/file/laniserep.pdfIn PDF document text
    • http://asesoriazabalburu.org/azaba/files/file/dilufutegogeji.pdfIn PDF document text
    • http://itcck.org/upload/editor/file/97120071882.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16132fd4cc5f2f---vanokerubanisus.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138605d8c613---30722650016.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/94617638058.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/punixeta.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/rubozapijut.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/ladaronagona.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=tr%C3%ACnh+duy%E1%BB%87t+web+n%C3%A0o+t%E1%BB%91t+nh%E1%BA%A5t+cho+androidPDF 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_off000101f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F6 29648 bytes
SHA-256: bfafc1ecd2f164d8374cd4d8ca821b38d5247cbaa103a766c74300bd129cf088
font_01_sfnt_off00013adf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ADF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000152f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152F6 11484 bytes
SHA-256: 4f0dcc0004c6d798bbff7e9333b9425d79919db85048b4fa9390cdb7e2fafe19