Malicious PDF — malware analysis report

Static analysis result for SHA-256 a400eee336122e03…

MALICIOUS

PDF

82.0 KB Created: 2021-08-02 11:10:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 73d5d90ae7f9d998489b89615ad1aafc SHA-1: 8bca19fb2f91caa1579c6a4ba8f5769e7356477d SHA-256: a400eee336122e03397f383b6c97247f7ee1a199929afff64cf98d426a208d1a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains numerous links pointing to compromised WordPress upload directories and other domains, suggesting a link farm designed to redirect users to malicious content. The file's structure and the presence of external links indicate it is likely used to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://nomylo.ru/uplcv?utm_term=download+piano+tutorial+pdf PDF link annotation
    • http://ebsenglish.net/_UploadFile/Images/file/52098398515.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/bb4404fdde687c0b7d02800794a5f0aa/movigoradav.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/popukabadiludibewanofibeb.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/b844fac0164234582cacb9a7725c9244/48241242919.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/48633858074.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/k5ooqj9t8q32jsjqjnusgbpoud/33168357632.pdfIn PDF document text
    • http://ridendo.cz/files/file/95582537250.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/ad534de8d177bdbcf58aaed6f2455396/wuritusixipovifejidutifuk.pdfIn PDF document text
    • https://pabrikangka.com/contents//files/xuwajemojosopejugalot.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/7cc2448f9859e343f640071ea5d3c31e/bafowibon.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16095847f84776---59700321129.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160924eafdfdd5---zazavilumu.pdfIn PDF document text
    • http://esthebel.de/userfiles/file/64249558089.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16098d1d4484f2---fuzefamexotoxowaduripuje.pdfIn PDF document text
    • https://phr4u.com/files/tejuwub.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/newuxuxobunaleginujase.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/575b2b0be70297d1acec484aad19b630/tazaxinoxa.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/73837007625.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bca37ebbeb9---22220850715.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/82644460361.pdfIn PDF document text
    • http://khacdautron.com/Images_upload/files/94941850757.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16078a71d10f7b---sisilosofodu.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_off0000dc5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5E 10376 bytes
SHA-256: d7828b954c75beaeffaa8db8737216489e440629f2491e35e0a172f62bec0f72
font_01_sfnt_off0000f3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EA 17840 bytes
SHA-256: 896d112ddb8862cf73e1e4335051b0c9f8c3a0ad663f2073717b494561b49dd9
font_02_sfnt_off00012341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12341 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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