Malicious PDF — malware analysis report

Static analysis result for SHA-256 1baf3f5caa10e3fe…

MALICIOUS

PDF

73.3 KB Created: 2021-09-11 16:17:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 94911f85a05b6a5f77edd770d178bc92 SHA-1: dc76f2443ccc4422c4dbd6af07cc74c9de533e1b SHA-256: 1baf3f5caa10e3fe3923dc16df3edb64bf89ad7bfd79e5f4d183b34cbdf0a0f8
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to domains flagged as compromised or disposable, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the link farm and the presence of external URIs suggest potential for further malicious activity, possibly initiated by embedded JavaScript if present and obfuscated.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://autoradiator.mn/uploads/ckfinder/files/ladaronagona.pdf In PDF document text
    • http://viorina-deko.com/images/file/58197648367.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/zemokabomewifamu.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/49502168448.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/buluziwedizogige.pdfIn PDF document text
    • https://kaimano.it/file/89443791144.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/pobad.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132a7c4c7bd9---67314100041.pdfIn PDF document text
    • https://theurbanthinktank.com/files/30320174637.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/dd887497d1f5043650f2e7ffc3868180/2378608273.pdfIn PDF document text
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/1579499395.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/e580215e5a6fcd73bc0b2c1cdc507f16/89060874911.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/25871900795.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/51260824555.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/78588587875.pdfIn PDF document text
    • http://cartopack.be/Images/file/72309421514.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/zurulibowanoraxasi.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/gotewajenex.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/kazoxuvezazopewegajax.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/70634454070.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613450953b1a5---losivotejilofinubox.pdfIn PDF document text
    • https://haisanquangninh.org/data/dulieu/files/90406020359.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/cssn1ociehq2s2lahg5gh30u23/gamuduw.pdfIn PDF document text
    • https://crbz.ru/userfiles/file/85194520628.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=body+temperature+app+for+android+free+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://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_off0000bbca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E1 10844 bytes
SHA-256: 751f4bde8605467a6ed1cb9474a2e83a362d82b02a0dc5f6eec7513ce76954fd
font_02_sfnt_off0000ecf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF5 16616 bytes
SHA-256: 41bfd1f46df386aa8046994c75c1c69d0c4c889382f0b3833c474e3bbee60ac2