Malicious PDF — malware analysis report

Static analysis result for SHA-256 73618d9f01b0bc03…

MALICIOUS

PDF

86.0 KB Created: 2021-07-21 00:13:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a212b23dde7e3b3ad648aca5c7a8caa7 SHA-1: 68bba0d7f060102e73f0d3e9141df19fdd5c0301 SHA-256: 73618d9f01b0bc034a9b18de61f31c054b6a5f316371c1bddcdcb850c364a01c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories. These links likely lead to further malicious content or phishing pages, serving as a distribution mechanism for other threats.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/cf98a13f311f5e85ddb0e146c2ae7e01/90049028977.pdf In PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609155d34a962---95699504342.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/janaritejutazuvew.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ba5a59775df46e97dd51929684dc7180/kepaluxojerexetokapob.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b99fa0154b5---53680398411.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef58af0e32---kajogosa.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/e2431fc907a6ab49feb674cd0bcbc620/94559178850.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/jademezogajidiba.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/juzojeriwaratedajivemezav.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/bda46578fac74cff769d8e857f52f4f2/kujunepawedojavukevix.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/71169789443.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160940211db1a5---96652776620.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/zujeduwaz.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/41458101237.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac2761407b---5006177057.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/66971085217.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/lakizo.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/57320252245.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608501da191f0---15014496789.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/15410675338.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16078045e5d5d2---59365896889.pdfIn PDF document text
    • https://gilbertems.com/videos/file/7193387779.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/99100744780.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=pointer+to+character+arrayPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10318 10228 bytes
SHA-256: b5741aaa47a91fff431cc93a6461b3e94faae761edf0de295acefa0adb9140c4
font_02_sfnt_off00011a01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A01 18584 bytes
SHA-256: 039dad70dea0c26855600ff5dbed026f1a8114efbb29a9fc70e01b7880390167

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