Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b0e1ac8c935ab51…

MALICIOUS

PDF

85.3 KB Created: 2021-07-20 09:02:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 94e6668c6bee93effa8a737e972084b5 SHA-1: 7aee64a63ba78657e0c72b5fb43970f151007ebc SHA-256: 7b0e1ac8c935ab5145b37cb74f6a35f35e9b7ccb803f58c80e84705e28214579
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The presence of numerous external URIs, many pointing to compromised CMS upload storage and forming a link farm on disposable hosting, strongly suggests a phishing or malware distribution campaign. The ClamAV detection and ML classifier further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 http://seamacros.com/upload/file/pajipipaz.pdf In PDF document text
    • http://abpaluso.com/upload/file/notolanadojoz.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a86fdb07852---jugisezegaxitaditedixug.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/59662649215.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/taxuvikujiso.pdfIn PDF document text
    • http://web68s.com/upload/files/rebojerejufosimubeb.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5b628a03c---26735832537.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606f36a275590---ruloxolil.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16078e947f147c---wefosupodijefe.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/gapozorotaxetusekoj.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160983e1530d0d---nitedexadudijetezewevo.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/zomifijesetaliguzozu.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/8957206471.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/32889664632.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/jipezivivuwodaninalotamu.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e2559c690---fupilikaxugubazevo.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084d4f7464ba---ninaroloz.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/81679627250.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf3af1b897---10690655976.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/a771fcf050cdc648a5437797eefcd3af/36185193545.pdfIn PDF document text
    • http://quaint-house.com/vaferurinanegitoge.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/50693054359.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/78153607150.pdfIn PDF document text
    • http://beytarimcilik.com/admin/editor_resim/file/71449366418.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/o9rii724ci2k52of4r0nsdhfmj/kuwidewuvilav.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a74c315cb8b---tosunadoboboxitoganugas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=the+numerator+of+a+fraction+is+5+less+than+the+denominatorPDF link annotation
    • 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_off0000e9cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CC 10936 bytes
SHA-256: 440b67d2963f66bf58dfa8aa4295e8ad89c16b29705148121c9d264f1955d56b
font_01_sfnt_off000102f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F0 16952 bytes
SHA-256: 62bd90d2af6d7443db4d93cfc61b040682a300eda5696f305638521d0689e89a
font_02_sfnt_off00012f26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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