Malicious PDF — malware analysis report

Static analysis result for SHA-256 acb0786f329caa7b…

MALICIOUS

PDF

70.6 KB Created: 2021-09-22 16:05:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4b9fdd9a8f2b8c06fbbb735c23f01b46 SHA-1: b0f5673ee7624adac5a6eabab5979e2b5ed024a1 SHA-256: acb0786f329caa7b9d117faf33f0a0f03f230972fca6e3d44c8b234423fe9fe2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution campaign. The embedded JavaScript likely attempts to redirect the user to one of these malicious URLs or download a secondary payload.

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
  • 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://laborke.ru/uplcv?utm_term=wit+motion+app PDF link annotation
    • http://medicaldistri.com/ckfinder_files/files/tiguriluvetowemeliluzum.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161327d54d26e0---maxawagiku.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/61902092919.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210909082601.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/sujijizozejajuwexexij.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614af61e73527---lonapetimapotomiviniwin.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/51028290189.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog/file/bumakizefafevufozifiv.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614408bc9b654---47250330975.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1614a1405def7e---46007413400.pdfIn PDF document text
    • https://sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/29781618324.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20210914180211.pdfIn PDF document text
    • http://ziva-muzika.cz/files/file/nimuzef.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/8724749158.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/josusoba.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/notunukipadopuxapizuv.pdfIn PDF document text
    • https://mountmoriahcamp.com/media/lazagez.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/27441766794.pdfIn PDF document text
    • https://hideab.se/tc/Mediagalleri/file/miviwifamovisezuserojewig.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/rixojuranubasupejew.pdfIn PDF document text
    • https://pharma-tools.pl/galeria/file/kumapepuf.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/vidibuwelibijumeporusa.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/xivuzufedurav.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/60252396588.pdfIn PDF document text
    • https://hsdinstruments.nl/uploads/files/balazonalivexofadom.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/99442717968.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/fgk8p3jcvdmtum0n1au7ph7fff/zeraboxapiwapebe.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_off0000b849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB849 14912 bytes
SHA-256: 912398a4a87601a7d7d5671a2ca737374b308a4654a0d97868c267e6b24e44af
font_01_sfnt_off0000de31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF647 9960 bytes
SHA-256: 03849b6a1e1697b875769935ae9b80dfaee3d35e46b236fd103243e175898d30

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