Malicious PDF — malware analysis report

Static analysis result for SHA-256 0177b533757a52ea…

MALICIOUS

PDF

85.8 KB Created: 2021-09-15 14:03:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9f9c7a4e0bfd986a7f3f2e1cb2951d8c SHA-1: 30f77e7ff022e3ccb55ef44b634a640087b58c6d SHA-256: 0177b533757a52eab583357b4de8b038e62e4668c63f1b5d9d074fb0e21ded2b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, potentially leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://nomylo.ru/uplcv?utm_term=remote+desktop+to+android+phone PDF link annotation
    • http://yokohama-model.com/userfiles/files/71901388590.pdfIn PDF document text
    • http://caythuocnam.org/images/files/rupenijutemiratomu.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/33015559795.pdfIn PDF document text
    • http://nakloboucku.cz/uploaded/file/ridujil.pdfIn PDF document text
    • http://bonsite.nl/phpcmsys/file/35210093837.pdfIn PDF document text
    • https://led7.ru/file/fegogezilawada.pdfIn PDF document text
    • http://gartenstadt-apotheke.com/userfiles/file/99644684019.pdfIn PDF document text
    • http://chikatere.com/Upload/files/mepuwirejapivopile.pdfIn PDF document text
    • http://erimti.com/userfiles/file/puxipijarajida.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/8794939221.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/58800643129.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/8a267e28221f28b489337b8b0b41aa52/23495574346.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/93665560753.pdfIn PDF document text
    • https://manhalhealing.com/userfiles/file/felaxafuwizezozujiji.pdfIn PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/80746810187.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2dc2600bf---gukufos.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/f545ab9c7e89a65aae138e875b7bf67a/92375663842.pdfIn PDF document text
    • http://timebymtm.com/upload/files/lofivagepoxuduwitinizutu.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/l6191mjjbd8modmv8vil1n8mj1/99317900753.pdfIn PDF document text
    • http://teakdeck.pl/files/file/34753779993.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-12/20210912210937135497.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/mogovikubalugezaki.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_off0000eacd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACD 18020 bytes
SHA-256: 28dc19ca2b37fe70c88e89836054ef06605aa057521b4091171586d337cddde4
font_01_sfnt_off00011923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11923 10748 bytes
SHA-256: 47e19c9ec992c74c8d759206a143e37317dcca5abfdf3caeb9b10d11ffb17ff4
font_02_sfnt_off000131b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1