Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e78392ef4476501…

MALICIOUS

PDF

64.0 KB Created: 2021-09-25 23:53:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: eec9dd2693e8101347e36aebf4416862 SHA-1: 91e64cbbfdcc0dc3a8e3eb9f3601a0a4c0aee17c SHA-256: 4e78392ef447650192ca6ded3f57f559269831c0598cabb82ab7687a22de2b94
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains an embedded JavaScript stream and a link farm with numerous external URIs pointing to disposable hosting and compromised CMS uploads. The primary purpose appears to be redirecting users through these links, likely to a malicious site or for SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5448

Heuristics 6

  • 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
  • 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://smidgel.ru/uplcv?utm_term=how+to+download+png+images+on+android PDF link annotation
    • http://technoauto.jp/js/upload/files/60346647237.pdfIn PDF document text
    • http://linuxnewyork.com/draft/media/tazoju.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/73476725989.pdfIn PDF document text
    • http://dylogistics.com/userData/board/file/36167340062.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614af3ab03025---solovujudemakalila.pdfIn PDF document text
    • http://naturalwonders.com/uploads/files/55543478552.pdfIn PDF document text
    • http://rm-centr.ru/uploads/file/silipaxopunazadiwi.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1613028455d029---nagoved.pdfIn PDF document text
    • http://dgxzz.com/uploadfile/file/wiwipuwurobagotirokejegot.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614da48cb74f1---64225085692.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/21992598658.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/740252191.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/83972582851.pdfIn PDF document text
    • http://frutapacargentina.com/ckfinder/userfiles/files/33941309547.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/3696170763.pdfIn PDF document text
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/tevuxamesoxapuxemefu.pdfIn PDF document text
    • http://www.tempshift.com/app/webroot/files/uploadimagesfile/26194030168.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/rurovavifagimixeredolusi.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131f71e17101---likemimenido.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/8gpkbm39jhk3n2v5uj2ofpinh5/78074080664.pdfIn PDF document text
    • http://decaiyun.com/upload/file/210914154957109204y6mx0mma25z5.pdfIn PDF document text
    • http://firesecurity.sk/userfiles/file/zisameloxemasabotuxesuk.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/12258537381.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEF8 15444 bytes
SHA-256: e823f86e6e4067fc02582ec38bb450d24180323409f56c2f7d1a608f3186bae2
font_01_sfnt_off0000d5db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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