Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1eb1ca83b8fb679…

MALICIOUS

PDF

69.4 KB Created: 2021-10-11 03:27:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6c5905dfa3f0ca85f26d43ac9ad058d7 SHA-1: fa6f606c16020603be2a701a45b1da691981e6ee SHA-256: b1eb1ca83b8fb679dde5598ba94b9667f0e55663a1998c8124ae6d2abe4f19ee
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file exhibits characteristics of a phishing lure, employing an image-only design with a clickable action to redirect users to external URLs. Multiple heuristics indicate it's part of a link farm hosted on disposable or compromised domains, suggesting an attempt to distribute malicious content or phish for credentials. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://cructi.ru/uplcv?utm_term=play+mage+knight+online PDF link annotation
    • https://begili.com/uploads/image/files/50828714299.pdfIn PDF document text
    • https://cometgroupinternational.com/ckeditor/ckfinder/userfiles/files/zugobavunufi.pdfIn PDF document text
    • http://patroha.hu/file/44053658047.pdfIn PDF document text
    • http://e-restauracion.com/app/webroot/files/uploads/files/77960846775.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210921093743.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ce4c062d2c---wokebezopokavuboxazi.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/75966815a5eba18ed5bae29d1cf9ae64/xoditu.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/pirorabezavil.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1ae58419cfe12402841cfc9e1e2d253b/gafumiwu.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/pefiduzumevitoletulan.pdfIn PDF document text
    • http://obedovice.cz/userfiles/file/tebafomuvifanaloni.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021091818130473499.pdfIn PDF document text
    • http://miryangpension.com/FileData/ckfinder/files/20210927_BFE6757B87733F9C.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/betenejovezefisatu.pdfIn PDF document text
    • https://temahr.hr/files/jolebotalumobagisem.pdfIn PDF document text
    • https://aqualibramontois.be/fckdownload/file/11096766894.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328aa006a92---babakogamefalej.pdfIn PDF document text
    • https://austarpharma.austarchina.com/upload/files/najatajebuzetaxifulixi.pdfIn PDF document text
    • http://jfhcoaching.com/userfiles/files/tukegigu.pdfIn PDF document text
    • http://hosteleriayvending.com/ckfinder/userfiles/files/77808754859.pdfIn PDF document text
    • http://szjg.hu/images/file/kawan.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/86575454452.pdfIn PDF document text
    • https://ego-sofa.tw/uploads/files/202110071250086761.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/6129235294.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/gawelapamabamora.pdfIn PDF document text
    • http://voyagevietnamlaos.com/hinhanh/file/37809812124.pdfIn PDF document text
    • http://olivetheater.com/userData/board/file/pitojepafat.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_off0000b5ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5AD 10492 bytes
SHA-256: e3298b4935cde6c5fef8209decf500c1e9e4386cffd5aa5d682cf174811a3fe5
font_01_sfnt_off0000cd58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD58 13928 bytes
SHA-256: 577f3472540396805a84c854f5098a55ffad43087c8149b3cb655545458cb7f5
font_02_sfnt_off0000efc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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