Malicious PDF — malware analysis report

Static analysis result for SHA-256 03495f44eeaa7aa9…

MALICIOUS

PDF

107.4 KB Created: 2021-07-18 08:11:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 26f4870cb13434fc6590142b2a75fa0e SHA-1: a49f3cfd308649b93b3f23e1ee982fbda1ee8bcc SHA-256: 03495f44eeaa7aa95948766d2d6e81196fbcfec961f3f18c59caf233f9df7381
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the embedded links and the PDF structure suggest it's likely part of a phishing or malware distribution campaign, potentially initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

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 http://zap-interactive.com/uploads/files/59226030026.pdf
    • http://duonglaohanoi.com/userfiles/file/82758330398.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/75cc34e64e5c80a7c38b7c51e2ae910d/ditasutoseva.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbe29fedcca---wonojesodugifewi.pdf
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/3db4ebd70eebc4028c4c6af206d553ea/samapisa.pdf
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5ca25f541---jikorixasugeriwewemakub.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762aea942fd---7548652180.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e1161625d---40622114057.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/9848601cc1d325bef7fc673ebadfbca1/bomameb.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/36a09e79b835e6859724ae92bca786c3/korajutosat.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e43bdb36b---71457852955.pdf
    • https://contabil-fiscal.ro/mm/file/37516512325.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c5ce0cec3---nadokogosifanubituretemu.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740f0d0b168---19435337682.pdf
    • https://mobilieroccasion.fr/uploads/file/nizafiwozukogokexij.pdf
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/d1e32adaed5e7cb1569e681dc55aa66f/dewosuxoporenix.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/9coims4680ggb1ubmj5kj5f1e7/50700715462.pdf
    • http://ventilatoryzlin.cz/images/file/74990797806.pdf
    • http://vienhung.com/webroot/img/files/tabis.pdf
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/4c64298e07cae022ab82dec7b63b019a/83947038383.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/3eec9d06dedd03855b6f91d3961c3f3b/wojowubagidu.pdf
    • https://hasekei.jp/userfiles/file/5872749293.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cee3d46c8f9---88532843231.pdf
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/t6d0m73g2967mfgmvchdmdodo3/25338214519.pdf
    • http://a1-automotivegroup.com/upload/files/56669012502.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=what+does+foliated+mean+in+rocks
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000128ac.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x128AC 16792 bytes
font_01_sfnt_off000140bd.bin
9ebce9c89ee5db785b574188380c5e3d264767197ea6048c9af1898d44ecc9cd
pdf-font-stream PDF embedded font (sfnt) at offset 0x140BD 17916 bytes
font_02_sfnt_off00015c4c.bin
655e18eac9bd2270d08ca1dce082ee1d0b534afa9eb66be2362b6f466c1852f4
pdf-font-stream PDF embedded font (sfnt) at offset 0x15C4C 10828 bytes
font_03_sfnt_off00017514.bin
c73cf51373408526f94ffcacd8e9abcfec042cc7623d4c99a42bea3b37a1e414
pdf-font-stream PDF embedded font (sfnt) at offset 0x17514 16520 bytes