Malicious PDF — malware analysis report

Static analysis result for SHA-256 a39f94536386cd5d…

MALICIOUS

PDF

81.9 KB Created: 2021-09-02 03:26:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4590814e749f696a937f8fb7ec981e6b SHA-1: d8d48cdcedc1d2019a2df4dde0ad1dfc473b1ae0 SHA-256: a39f94536386cd5d2b2832adb7c9bdf1f41f177a0eee2fedf5d37ab74b288094
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm to distribute malicious content. The document body is heavily obfuscated and contains no readable text, preventing a more detailed analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://coluer.ir/documents/file/30244274647.pdf In PDF document text
    • http://saothienemb.com/uploads/images/files/fijudibav.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/58585824519.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/d542181977953037ffbd358467e92d0d/50344077686.pdfIn PDF document text
    • http://kleiberit.ru/files/file/23674948837.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/pepumopogusolujawavow.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6825da3eb---84192579929.pdfIn PDF document text
    • http://grupophi.es/uploads/files/motupar.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16071de597869e---62891309864.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/udhr95cdm10mncgo8nu25g30d7/18626792042.pdfIn PDF document text
    • http://roocenter.ru/upload/file/jipidemenivulaketaw.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/36faeea24ac412461f76373904e9fca9/pawad.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/79100955736.pdfIn PDF document text
    • http://fitviewer.biz/files/file/60919218141.pdfIn PDF document text
    • http://alltechsro.cz/files/26377805480.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/0960ee3ecfec0ca28fcb313b49e2bab9/42211815157.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/meboka.pdfIn PDF document text
    • http://daphongthuyhueminh.com/uploads/image/files/59482910165.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/xopogoluzeli.pdfIn PDF document text
    • http://epoptavky.com/is/images/FCKeditor/File/ratasisizoboxumuf.pdfIn PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/hnsgdpd0pe6s7hiuf21sv5s41a/subitekobojajiwalo.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160986f6540de7---depijusizu.pdfIn PDF document text
    • https://ancoraeducacion.com/images/jalirumemudewapi.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca94124f69---67153029810.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=deselect+magnetic+lasso+tool+photoshopPDF 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_off0000dae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE0 17904 bytes
SHA-256: fdbf20c03bbd5db2cd4f2281d5fea3e8907303b6a8f5d00692a2311df5e647b6
font_01_sfnt_off000108d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120EF 10724 bytes
SHA-256: e7f25978c85d3d693d624085b63c236e1bf48c5c8410118db4236039d0f9126e

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