Malicious PDF — malware analysis report

Static analysis result for SHA-256 25cc149cf37f99b4…

MALICIOUS

PDF

81.9 KB Created: 2021-09-22 12:51:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 15f5b3d40a1aec36ae7a97ecb97ed986 SHA-1: 82b368cc32c10cce06655083c5319d583e5da97d SHA-256: 25cc149cf37f99b464c087036f8c10a39dc2d9b542781e48c6e40ecd8514c38a
164 Risk Score

Malware Insights

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

The PDF contains an embedded JavaScript stream and numerous URLs, many of which are hosted on disposable domains or appear to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a strong attempt to obscure the final destination, likely a malicious payload. The ML classifier and ClamAV detection strongly suggest malicious intent, consistent with a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://coretry.ru/uplcv?utm_term=andy+launcher+download PDF link annotation
    • http://ufnk.fr/app/webroot/files/file/94800174676.pdfIn PDF document text
    • http://eclickapps.in/userfiles/files/kojelezositobi.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/86114614397.pdfIn PDF document text
    • http://warungmimpishio2.com/contents/files/moluwanos.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/kefajogovivozufitow.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/10537296163.pdfIn PDF document text
    • http://48bulls.com/js/upload/files/16543611850.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/68314930269.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/gabarenififalenojomiziwa.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/94404499083.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/55182710546.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f594774234a1db0ca2f5127497e5647c/83966577376.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/161373e7a66366---20671651832.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/mokuvevuwasakowox.pdfIn PDF document text
    • https://powerliteaac.com/userfiles/file/pemipebowuzumo.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/pidaninugasi.pdfIn PDF document text
    • http://hijoin.hu/editor_up/bawivuxifowidovi.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/vutawubozitamujupamiku.pdfIn PDF document text
    • http://fivelscope.net/fckimages/25877198756.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23325836572.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/61402306064.pdfIn PDF document text
    • https://laundrybyconrads.com/nbloom/fckuploads/file/22315394806.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16138129a89151---48009850115.pdfIn PDF document text
    • http://adice-area.com/pictures/files/80559098468.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_off0000dddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDD 10388 bytes
SHA-256: b635134b2a9d529a89c1bba3147a142b741ca6f1794709489b7ab0cda8686747
font_01_sfnt_off0000f560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF560 17288 bytes
SHA-256: a958bfd6d059a4c0866d31acdba39a5906dc8b655676202605b2165127aa8852
font_02_sfnt_off00012223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12223 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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