Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bbd773899fa979d…

MALICIOUS

PDF

77.9 KB Created: 2021-09-04 11:18:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f8e82505545d1945fb69743bbb17ed20 SHA-1: 0267342467ac503ff572c4c88754c8f2d1cf863a SHA-256: 0bbd773899fa979dffe72c08af7ec5a227dd8990c71176a3bc49534a2129d656
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://artistalexanderkanevskyroyalshakespeareglobetheatrelondon.com/clientMedia/file/pesalixirobomid.pdf In PDF document text
    • http://zkojicin.cz/userfiles/file/66284255972.pdfIn PDF document text
    • https://33mobility.net/uploads/files/nixepelesavodufep.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/zabemazipoxojuvilerutak.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607b41f80e40f---80365112506.pdfIn PDF document text
    • https://shinko-tw.com/UserFiles/file/sezugexixaxevelotejer.pdfIn PDF document text
    • http://chromowane.com/userfiles/file/61695481063.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/5018f9d2e2cb597335e35beb5c1c17bd/68676918031.pdfIn PDF document text
    • http://48bulls.com/js/upload/files/9516137000.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/11545420121.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160875644b662d---84032206891.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/tup9oo659dgvneqka1upvfl483/romutikun.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/n2o33id9n65b0iv9kruh2p9stb/larafinelapifuf.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e4668f6bb7d---56687690265.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/86749087225.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/8473515665.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c65f9577fc5---70161679344.pdfIn PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/29855563339.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/besopojalevenok.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/104dbd2e05335f5dc07dfd39cdd36cfb/dadaguvoj.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16102b2b66b276---tejaxuzofo.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f889cb64532---kanigevovebi.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210714035340.pdfIn PDF document text
    • http://zonweringbelgie.eu/ckfinder/userfiles/files/polal.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160875cbb6c439---vazasegagovudup.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/fanad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=1st+grade+dolch+sight+words+pdfPDF 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_off0000cdd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD6 10836 bytes
SHA-256: db585244b93e2508678cc9ae8740fbfb43d818d776969ec41f4fb0018ab63eca
font_01_sfnt_off0000e6d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000feeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEB 16744 bytes
SHA-256: b4abd998faa636908e2fb1dad14e46ae55d55d0ca02025af787b4a9ba4e22d9f

Open this report in the interactive analyzer, or submit your own file for analysis.