Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7ed3f579efc6dde…

MALICIOUS

PDF

86.2 KB Created: 2021-06-25 10:24:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: b57ec18fe9609919885e05df0cf14801 SHA-1: 751178890d530530838313c57253babb0e9a6de4 SHA-256: b7ed3f579efc6dde85cc72cba9e35c1ab272657059161ad771a350a92b3479e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to multiple compromised CMS upload directories, suggesting an attempt to host malicious files. The presence of 'yowhatsapp v8 70 download' in the document body indicates a lure for a fake software download. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8f7ed72d9---faduxupo.pdf In PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/55f0b96a6c8df5b02ba7a9c1c4e0046f/degejudibixuxizi.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/9126664199.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8bcc471af---71266761080.pdfIn PDF document text
    • http://robalton.es/Albums/images/file/%5C/dunodulolen.pdfIn PDF document text
    • http://industrialdevices.in/uploads/javuvepobunusudulel.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16079574e86738---4188012644.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/fuxurofalimekew.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/ce8e00bd11b57ced41a7d919c490c63a/59186935601.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/67096384879.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/33507564160.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721e68d44b2---gomidasupidaladuralunos.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/faxubidixokox.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160beee1defb6d---10025043503.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/72198563483.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/55418832893.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b4f9f1e2b---zivobibexamafuvoximapaguk.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b9de2c8124b---21541028978.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/desete.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1607f41beee2b3---guzazipajitunedagapufe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=yowhatsapp+v8+70+downloadPDF 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AA 5100 bytes
SHA-256: 46634fc805563316783cec6d2b8c72429c00b606a092fe7a305eeceab75fb4eb
font_01_sfnt_off0000f405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF405 2664 bytes
SHA-256: 545e263005fa771c2b604e6309df2829638f0916849b5315591f77a10e613dce
font_02_sfnt_off0000ff52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF52 11220 bytes
SHA-256: 72f879b69b2956c161e19c9a2f25bb05a35a6c1f2c32462dd10b474ea7f3b0e2
font_03_sfnt_off000125b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B2 16556 bytes
SHA-256: 7c955acc4ea5b7dc0a968cc71721faa81beee06790c350fbc78a096d838c30e1
font_04_sfnt_off00013c3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C3D 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c