Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9e7497b20ce9675…

MALICIOUS

PDF

71.2 KB Created: 2021-09-18 18:14:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8f026ccfc9db2156887857c46dfea2f4 SHA-1: 6cadea171ea6cb82f67aaae33e0aa3c694186321 SHA-256: b9e7497b20ce9675bfc517b464ec1d766ad869dc536522b9b5ecbf15e2646193
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains multiple links to external websites, some of which are hosted on compromised WordPress sites. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user on how to open a password-protected archive, a common tactic to evade gateway security. The presence of embedded URLs and the nature of the heuristics suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://laborke.ru/uplcv?utm_term=how+to+open+password+protected+zip+file+with+password+in+android PDF link annotation
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ab5f37512---wejif.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/jutugixenivok.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/zufixiwekef.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/17f87lke67j885fpv7oeaivud8/55831526315.pdfIn PDF document text
    • http://intimatehotelpattaya.com/image/upload/File/15609126986.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/11559709289.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/38134023127.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/furanoxid.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133dbc64685f---68504445083.pdfIn PDF document text
    • http://hebakotb.net/userfiles/file/74058526244.pdfIn PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/61556107710.pdfIn PDF document text
    • https://rm-parketi.si/uploads/50901475006.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/62089674418.pdfIn PDF document text
    • http://sql110.com/pic/jibitiwerovejimiseluke.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/kifefemawifavove.pdfIn PDF document text
    • http://koreadramatour.com/FileData/ckfinder/files/20210909_909DE3B8102C837C.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361dcc3687c---82969488353.pdfIn PDF document text
    • https://yellowmangocafe.com/userfiles/file/lamip.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/gapiwovefujenoxupikar.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613478fa5982e---jometuragawibedofozotepos.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/23279346005.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/10696723791.pdfIn PDF document text
    • http://cannamelis.com/userfiles/file/7159153023.pdfIn PDF document text
    • http://naoshima-habitant.com/images/blog/file/xefikoxi.pdfIn PDF document text
    • http://oldstat.ww.tj/img/file/72306634188.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_off0000b6a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ceb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB4 15668 bytes
SHA-256: 898764add65715a607a1d5b218b2b09dbbc437eef6516674a956ee81e7565b32
font_02_sfnt_off0000f531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF531 10852 bytes
SHA-256: 5815567225068f6c31cd25ff2b6e488fa097237ee90fd8583aa5c8ada5041df3

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