Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4d2ed9c7634be50…

MALICIOUS

PDF

83.5 KB Created: 2021-09-04 01:28:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4ca79a00acb9c46ce92c80541ef3b3be SHA-1: 8a5e1dfa625abc5fd0dfae949cf0c11949314d7e SHA-256: c4d2ed9c7634be5063fbfa0cf45ddd80c3a237c97e29fea647eea099a61e6ced
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable domains, characteristic of a link farm used for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns suggest it's designed to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 http://needychild.org/ckfinder/userfiles/files/wosajexumilijiremipadeki.pdf In PDF document text
    • http://amadpich.com/userfiles/file/kuwusaxebobufidopedetas.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/gixujinazewumoxirogudinem.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd1ee9ef0ee---36133023484.pdfIn PDF document text
    • http://bonapartefamilynetwork.com/clients/7/7d/7d081654635712149502d88e72c54c2d/File/logumetekobogegusa.pdfIn PDF document text
    • https://elektrona.cz/files/file/20519144205.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070025135db6---vusemutu.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/wivofux.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/f3a57faa0643cca679dc5decedd9e2ee/tiritosut.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/4456155ea90b2e180c0eebaf8abba3ea/mawezorov.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/18af497869f60997369d1564d02115a7/57898415929.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/20203369045.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/bumolaj.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/xedatu.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/52546090786.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/kl3ukks8h37h3at9d96iunbr79/zolegapadisujaju.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210825194604.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/e8ba067fc8f8dfa2a821d4f48d413c4e/64836383064.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/jemosatujanimuzelilovi.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/23225130516.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/buzonobezamuper.pdfIn PDF document text
    • https://officialbacknumber.com/editor_up/wabetijakipimikoz.pdfIn PDF document text
    • http://kreativitaet-stadlhofer.at/global/images/userfiles/file/nudurosasimewukonebe.pdfIn PDF document text
    • http://www.dreamstoreonline.es/ckfinder/userfiles/files/71550074619.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160d01e7492d8a---25844689293.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160e4b85f848b3---ximafisukejawamafiwuruzex.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/41150403256.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=metrology+and+quality+control+reference+book+pdfPDF 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_off0000dd3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3D 11212 bytes
SHA-256: fe7ddc18065c6e7f53dc841c42018f9f91b991aea710a84824266dd46821b209
font_01_sfnt_off0000f6df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DF 18560 bytes
SHA-256: 1473b520a1d81c1354b8dec17aeed03e43415148e0e607f755b08450daf5871f
font_02_sfnt_off000127a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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