Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe28d1a0fe03d085…

MALICIOUS

PDF

73.5 KB Created: 2021-09-24 12:54:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1c0f98628fde29e51835a473ee8105ee SHA-1: 1a9e3fc6e9341a3d91603cf165f65e09d95f6961 SHA-256: fe28d1a0fe03d0850b993460084b959b298923ad860f5e0b67c9673cd80bcc44
164 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many hosted on disposable domains or compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. An embedded JavaScript stream was also detected, which could be used to further facilitate malicious redirects or exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://huntic.ru/uplcv?utm_term=call+divert+samsung+galaxy+s3 PDF link annotation
    • http://autosoftware.company/autoresponders_images/files/6449779538.pdfIn PDF document text
    • http://haki.vn/uploads/files/34319872657.pdfIn PDF document text
    • http://mos-craciun-inchiriere.ro/fckfiles/file/46804172776.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613d079661517---bawiruwurisizilegewamu.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/73180442208.pdfIn PDF document text
    • http://ippon.lv/uploads/File/sopagazavexuxitoti.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/pagevutunula.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/zubuloro.pdfIn PDF document text
    • http://bulmarconsult.com/files/woworewilozudejub.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/5gme602fciclui6qnsfqkqiveo/nagosuj.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/jixovafuwufigebosufer.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/kakejepatujulo.pdfIn PDF document text
    • http://laureysnv.be/uploads/files/49989538945.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/newozidenolujudupazivudup.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210912_040609.pdfIn PDF document text
    • https://il-gusto.com/images/file/jezenijafupuxijun.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/memono.pdfIn PDF document text
    • http://keralatravelpath.com/uploads/file/46207039572.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16138492ac5560---32541217500.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/53780183904.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/92030342085.pdfIn PDF document text
    • http://kaus21.com/userData/board/file/97273845424.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/49905545882.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/94122509859.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_off0000b59a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB59A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB1 11056 bytes
SHA-256: ca879add62a9e2d082c82c5aa15a662e6634906bdf56b475d8df5d3b13de89b2
font_02_sfnt_off0000e746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE746 19000 bytes
SHA-256: 3d6a22a80b4a3c681ff4cea5a66bde138606b7d8124b0eddbc634b5fc96983ac