Malicious PDF — malware analysis report

Static analysis result for SHA-256 829d354f8de2bddb…

MALICIOUS

PDF

87.0 KB Created: 2021-07-21 22:29:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b1dd4084e575e7ee0b9fd34d8a04cab9 SHA-1: c46e4de9e381e5897bff516c8078da2c6ff7e9a8 SHA-256: 829d354f8de2bddb159f690aa6a3a2def057ab87e1030350e80cf08af5e2b8f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm intended to redirect users to malicious content. No scripts were extracted, but the presence of multiple external links and the high confidence detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://humanitool.ru/userfiles/file/kumamekopotamirugol.pdf In PDF document text
    • http://cuacuonductudong.com/upload/files/xadarip.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bcba6812f5---59316664427.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098bdef9fe78---63332486988.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c8c2d0a63---28026246335.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/nrc14f5n78v4ivh8t7hlo7a9dn/66595658441.pdfIn PDF document text
    • http://agrion.org/upload/fichier/71284210537.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/92442457999.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210706032516_pkgwfl.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/72982572972.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091566939998---kitowu.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/20208107250.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d987e447f7d---9886864136.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/28622091473.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/8e9649a364e326966007054502c74601/berozilu.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/rizozapaso.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/jolofeg.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/05a757fbf8bfd12d0f2e4da270aa0cc6/tozonodupupebupaginifunar.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/64207451819.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/65e3f21dbcf406bcbae8aee3254e9766/6216029154.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/4221576633.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/7i1t1c1nct3lnvnviobihegmfq/25904376767.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/20413146350.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/041d4659f2a6f541745ad2ab3a4056e9/66370865974.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609415860174e---gomak.pdfIn PDF document text
    • http://khanaphatgroup.com/UserFiles/file/jezuwedilom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=south+east+west+north+southPDF 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_off0000f0db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DB 10328 bytes
SHA-256: e44158f41ca7aad991290de08c87da2343130ea7f68d538f8e792580797c4d2a
font_01_sfnt_off00010835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10835 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12047 17508 bytes
SHA-256: 5cda1e5ef25459cbedfe68d4a3ae87ef3220eb463e030e5eb0d79ef66d08deda