Malicious PDF — malware analysis report

Static analysis result for SHA-256 0543b7fbbe7b3f08…

MALICIOUS

PDF

79.2 KB Created: 2021-09-04 17:50:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 870a12d297497327ef0e271686d0448f SHA-1: 8f7e3aadb25304f457b2ddac4287788e83a5d796 SHA-256: 0543b7fbbe7b3f0803b34b23f2877fb4d52b8b7b426c147b9f8ee2a1dbc31419
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a link farm pointing to multiple disposable domains and compromised CMS uploads, suggesting an attempt to distribute malicious content or phish users. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate malicious intent, likely involving redirection to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://makingtheturngolf.com/clients/9/92/925d9bae4ecf380f28dbe0e1390c16eb/File/7955797127.pdf In PDF document text
    • http://qianxi.cn/filespath/files/20210812173232.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1b27be1f1---funemupil.pdfIn PDF document text
    • http://nuocmambason.com/upload/fckimagesfile/8c6aaa59a61d7ae59671600e49a60ea7.pdfIn PDF document text
    • https://kuepancong.com/contents//files/vipuliguj.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/butagekibaripuzivekuxaki.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c45cf3b7474---voxewesipinirawogutez.pdfIn PDF document text
    • http://apple888.vn/luutru/files/99772677005.pdfIn PDF document text
    • http://shield-in.com/userfiles/files/59688588009.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160862f6b881e4---zemuje.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/zazebetapafilevujevul.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/75615617078.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/c223bb7e8ef2a96590eb17eb3b91383e/kibaboruwa.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/dimiponemof.pdfIn PDF document text
    • https://giasidaily.com/uploads/userfiles/file/21992829981.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210812221043.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/tozagux.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160998432a19ff---lirizujimakuziweginiku.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1611e06566a6c7---70827045836.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/d1c9e62bed257aaa59b21a38736f6dce/61098691460.pdfIn PDF document text
    • http://gibisch.com/files/files/gafevelu.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7cee347ee---70457252751.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/85e37f2e59f3968b9f2ea1ebb894de35/danup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=dancing+queen+mamma+mia+sheet+music+pdfPDF 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://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_off0000d0aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C1 11048 bytes
SHA-256: e9af53e6278b812b8feb21ae60e565b5c2228dc7956f178519d4a918f6ecac0b
font_02_sfnt_off000101ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CE 17476 bytes
SHA-256: 2b52e49e310577917ed8ccf3e0e25e739b7081efcf1631b16ea9733289e6692a

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