Malicious PDF — malware analysis report

Static analysis result for SHA-256 3581a1a68d22d2a5…

MALICIOUS

PDF

81.9 KB Created: 2021-09-16 19:27:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 51a09c599c009e294163f25ace5fa755 SHA-1: e372c180bd51b539eb6a4ab2df84013d10dc0ef5 SHA-256: 3581a1a68d22d2a571d6424dc91d6240ef67020de7747029d1e0490adb8abb39
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories. These links likely serve as lures for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://philabc.ru/uplcv?utm_term=download+omega+ruby+3ds PDF link annotation
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/5490b2129aef4765f913b3adb7cf3471/1727144708.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/77365254837.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/026bee71918ba0c2aece4a1d19382ac0/linirexupesiwe.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/97119807054.pdfIn PDF document text
    • https://istruttorecinofilo.it/userfiles/file/47261178772.pdfIn PDF document text
    • http://apicn.net/upload/files/bokiwuxoxujofuriso.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/nemaragujugoxavavepumisij.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/xizadizonebarapifodego.pdfIn PDF document text
    • http://ozkayalarlojistik.com/userfiles/file/70485320126.pdfIn PDF document text
    • http://gzbaosui.com/uploadfile/files/fesapitegidekimi.pdfIn PDF document text
    • http://irastuff.com/admin/ckfinder/uploads/files/97557867881.pdfIn PDF document text
    • https://kaptenhoki.org/contents/files/54004018850.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/wimudalorowedeludogaxuvad.pdfIn PDF document text
    • http://lblussana.it/images/file/89442750411.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/4990d621fec46d4dedc5b579f72d1c52/95820480.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/31830827042.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16136e22733841---xevututulewufoxuvedu.pdfIn PDF document text
    • http://gearcon-eng.com/file_media/file_image/file/nozosekuze.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/neposofexifobavazipexime.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/5713612512.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/rujosemogosugarira.pdfIn PDF document text
    • http://vonschickenfremont.com/uploads/files/tifonijejikej.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/sisikowos.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/23288775518.pdfIn PDF document text
    • http://szm.hu/userfiles/file/77904611128.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/91725715181.pdfIn PDF document text
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/38531180452.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_off0000d392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD392 20060 bytes
SHA-256: 9ebd4e53a4abc97c5408ca8462ff0b85cd58b42b3decd02e0ed6f34ffd72d7bf
font_01_sfnt_off00010884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10884 11016 bytes
SHA-256: 565af466bff23aca4a7af49311fb1b71df8d5d70d8f769564438acf3098be293
font_02_sfnt_off000121f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1