Malicious PDF — malware analysis report

Static analysis result for SHA-256 d17785188230403b…

MALICIOUS

PDF

81.1 KB Created: 2021-09-23 14:26:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b77ee065f04be959b40a322af5308a99 SHA-1: d8b12c71ffe921103aa5298c4122548e55798c14 SHA-256: d17785188230403b81a13b7b6534e9678050f8c87b34aa6169dc05ebd361a0ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The presence of 'utm_term' parameters suggests an attempt at SEO manipulation or phishing lures. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=windows+8.1+installation+key+64+bit PDF link annotation
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c723be7117---pasolu.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/53478ce82e322d2cc2e9817a35f089fa/61774530652.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/64774054016.pdfIn PDF document text
    • http://rambud.pl/uploaded/file/53024718764.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/28100644555.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/raxotetisulun.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/59032215583.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/xolodetug.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/84703265915.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/dawudil.pdfIn PDF document text
    • http://80tner.friend-match.com/upload/files/20557517082.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/60994395793.pdfIn PDF document text
    • https://successalpha.team/upload/files/lumaxelajamu.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/99580552697.pdfIn PDF document text
    • http://villahetzwartepaard.nl/survey/userfiles/files/7867330772.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/21903338166.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/94484936009.pdfIn PDF document text
    • http://cochemical.com/upload/files/dojadukifixamojivuva.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/82638047035.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141140c57bf0---bufefibikokomoxif.pdfIn PDF document text
    • http://studiotecnicoligioni.com/userfiles/files/37357362898.pdfIn PDF document text
    • http://nm-union.ru/ckfinder/userfiles/files/36484860011.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/55029221366.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/71730401535.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_off0000d65d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65D 11136 bytes
SHA-256: 28e838339ad628276badb04b50b0e3d9dd69c32cf05799867d13da58b81ff401
font_01_sfnt_off0000f0a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A1 18008 bytes
SHA-256: f070ca0b45fe27c15b34250f756daeeee8074c038b18a36d3d2561f7faf7c154
font_02_sfnt_off00011f13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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