Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f77a9d0779e5e74…

MALICIOUS

PDF

82.2 KB Created: 2021-09-21 04:05:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9fa2506da9e8489926165c6e6df6da9f SHA-1: dd968c96b49c4b8f80f2a1d82d015beece8895c0 SHA-256: 8f77a9d0779e5e7457d82c3f6a937e865eb35897a7df4bc487ac8c3d4cff4657
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, exhibiting characteristics of a link farm hosted on compromised WordPress sites and disposable domains. The embedded JavaScript stream likely facilitates redirection to these malicious URLs, aiming to trick users into visiting them. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=phone+as+webcam+pc PDF link annotation
    • http://khachsansapa.vn/webroot/img/files/73202101709.pdfIn PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/fazetusuzujupenisivepali.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/94654492939.pdfIn PDF document text
    • https://willes-gb.com/uploads/files/202109130012294231.pdfIn PDF document text
    • http://fuguchair.com/upfolder/e/files/20210910012510.pdfIn PDF document text
    • http://www.hausbaumesse.at/ckfinder/userfiles/files/10100685371.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/mapemagapodilufexefojebe.pdfIn PDF document text
    • https://inprovitcentroamerica.com/ckfinder/userfiles/files/fararesewupu.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/40328887710.pdfIn PDF document text
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/63447372911.pdfIn PDF document text
    • http://xn--elementy-zczne-kwb98g.pl/media/file/sezupena.pdfIn PDF document text
    • http://intproplaw.com/admin/uploads/file/32163135347.pdfIn PDF document text
    • http://sigmabhp.pl/userfiles/file/35912407253.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16141386d43c75---39036093300.pdfIn PDF document text
    • http://chuanghuilaw.com/filespath/files/20210914132508.pdfIn PDF document text
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/fojoxuvamamunelakop.pdfIn PDF document text
    • http://nhungbaithuocnam.com/img-tvdl/files/jivobuvedifujif.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/46b55eca41c773e98b893f686fa40456/70360360655.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/vikulimetonetan.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/59958336613.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/4899f40bd3674d380ec74d0d9a3ea164/futirimovokimajo.pdfIn PDF document text
    • http://htwy.com/upload/file/81440627668.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/97798217367.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/70020016350.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_off0000ddb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB9 10532 bytes
SHA-256: 1dc07d28116d503da77ca18c065a87c4e129b38dd51296b9dc50326caf310cfb
font_01_sfnt_off0000f560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF560 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D72 17732 bytes
SHA-256: e717bcb9a51dc4607114b51616711c0cba251059819b3ccf58ff3a1e639b1285

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