Malicious PDF — malware analysis report

Static analysis result for SHA-256 3598df07f4a56076…

MALICIOUS

PDF

82.8 KB Created: 2021-09-06 19:42:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: f8d7ad6e80f13892f23194b41ef7414b SHA-1: a6d6a15807be341f61e06775d363d4262063483e SHA-256: 3598df07f4a5607652f7ad7c1455198d13d18259ca4ae5ea0fa74ae3e498a9ab
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of link farms on disposable hosting, suggesting a phishing or malware distribution attempt. The heuristic 'SE_INVOICE_LURE' indicates the document's content is designed to trick the user into taking action, such as clicking a link. While no scripts were explicitly extracted, the presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, along with the ML_NYX_PDF_MALICIOUS and ClamAV detections, strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://nomylo.ru/uplcv?utm_term=service+agreement+form+pdf PDF link annotation
    • http://sgd42.ru/userfiles/file/bivodazamapisezo.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/79299635202.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/42226233340.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a75e94f593---pejevekofexibixutaka.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/95464174491.pdfIn PDF document text
    • http://mrukseo.pl/userfiles/file/16348185185.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/k468q1ne39d9n6ck46u9su0778/3382275996.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///39373587541.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/tajoworalanifat.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1612e91dab45f0---dunebisazojuvolaropewox.pdfIn PDF document text
    • http://otczenacts.com/media/files/wikavex.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/b3796423aa10030f4cb74045e66c7b6e/zawavijovi.pdfIn PDF document text
    • https://atrax.hr/files/dasolilusi.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/v96nr14k4ef34bljspve9q37r4/63321286897.pdfIn PDF document text
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/belamutipodonovefered.pdfIn PDF document text
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/biwalijezivitexeb.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/kirat.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/fdba21e445c86ddd18773a2063532e3a/99218147556.pdfIn PDF document text
    • http://bienbao.net/uploads/files/66281733500.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfd2da112a3---76669997095.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/26194986524.pdfIn PDF document text
    • 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_off0000dea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B4 17952 bytes
SHA-256: 123cd3ab938518a081e26efe72e3cc7b9e81f30d7cbef3a70e422d2b114d0ef8
font_02_sfnt_off000124b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B9 10888 bytes
SHA-256: 56a649b85cf01878bddfb48e783e4260dc75bb9342e48010e956ec8e36824874

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