Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef1505cc15ad3e45…

MALICIOUS

PDF

69.9 KB Created: 2021-09-25 20:08:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fd504953ca780d3e0477a28a3895d50c SHA-1: 397878b1519d350182bf95cefaa06e425e771e95 SHA-256: ef1505cc15ad3e45ce2e66b3320486595bf5487bb95de1fd33d351c9050cf8ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to numerous disposable domains and compromised CMS uploads, likely intended to host further malicious content or phishing pages. The primary purpose appears to be directing users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • 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://queure.ru/uplcv?utm_term=custom+notifications+and+quick+settings PDF link annotation
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/8264290687.pdfIn PDF document text
    • http://www.smartusb.info/images/library/File/gibaka.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/54077232522.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/gbhkus902rck0omjr6ermi6b7k/46755613911.pdfIn PDF document text
    • http://haki.vn/uploads/files/zabakekeze.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c15900aa9f---bekomofadaweris.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/rixoxirejidoselibidep.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/88223992315.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/c41fff538567b1ba5f6dd10b663bf72a/wotebetumamadora.pdfIn PDF document text
    • http://bloodfaces.de/attachment/file/93886225369.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/rigaboke.pdfIn PDF document text
    • http://euromarkcreations.com/new/fck_img/file/fivojezakirujesasisudobek.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/52770439247.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/67250132357.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/witavitabavapuvejazur.pdfIn PDF document text
    • http://tongshengchem.com/ckfinder/userfiles/files/11874300574.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/zinukafaradukapijal.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/75203933732.pdfIn PDF document text
    • http://www.ezmoving.com/file/goxebefozupozibomi.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/73546575181.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16137186c1aa0d---rejufovim.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/7e14d157d8a5b245e8ecdb21f9383bdb/32972803833.pdfIn PDF document text
    • http://caigeshi.com/uploadfile/file/2021091702505873499.pdfIn PDF document text
    • http://thekreativecompany.com/uploaded_files/userfiles/files/fufomobobatisumadotabitox.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_off0000b3bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3BF 11044 bytes
SHA-256: 4e2334b382659d3a3ca0fbf5ee4e0647d30fffaaabdabfb09758f3649a4a0beb
font_01_sfnt_off0000cd03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE515 14592 bytes
SHA-256: ca9c947e34df154c9cacdba04ae7ea4f2029dd03ccc1d7de307b95b6a3ab577c

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