Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ee9cfe29b08eeb8…

MALICIOUS

PDF

82.2 KB Created: 2021-08-19 14:56:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 340decf8ef5c08e1ff2c4016cb3be856 SHA-1: edb8e5eb7987f5ed6c5ed6211f54a4f3e2caa733 SHA-256: 5ee9cfe29b08eeb89406a06e7130ac3bbeed14c23277af0eb73a845e831dc2e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm or redirection mechanism. The primary URL, 'https://queure.ru/uplcv?utm_term=carta+de+cumplea%C3%B1os+para+una+amiga+hermana', appears to be a lure for phishing or malware distribution. No scripts were extracted, but the PDF structure and URL patterns are consistent with phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://queure.ru/uplcv?utm_term=carta+de+cumplea%C3%B1os+para+una+amiga+hermana PDF link annotation
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ad938053761---2006608797.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160757f43b0edf---97048464276.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/kiwutagirovotelewat.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/kijoro.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/zinarewesorebipepu.pdfIn PDF document text
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/59019746684.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160814f80cf0b8---govidomuninuz.pdfIn PDF document text
    • http://redtopmarina.com/clients/7/72/7297c65379f6126c97b8b18e62fd1dd4/File/55157278240.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160970daab9019---gimaduwiluzejeda.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/c4fb1de729911de6c246e886c362dbdb/16996589382.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/82f0f50f16748a82bab0ca796636fe00/sukadapovizugex.pdfIn PDF document text
    • http://primethailand.com/ckfinder/userfiles/files/wujaxupuvoxabovikarawuk.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/59732379010.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/90123189577.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/f217412de423c52afa1c0a4a73ad4642/93514427652.pdfIn PDF document text
    • https://peltonfell.org.uk/ckfinder/userfiles/files/51898883867.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/o8ecat7md5d0485b3lss5pfvr1/pejilukipokan.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aab3d95f956---6981287089.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/98490241540.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/fl5jubppnpn6ud61tgnbm60j0g/56013664418.pdfIn PDF document text
    • http://marjoleintje.nl/include/userfiles/wezizoj.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/wifogibanusegekovo.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/dasokopadagimufaxux.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/69142554787.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/30325466355.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_off0000dbec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEC 16944 bytes
SHA-256: 0efeb2153a10aefed2c33116f740ffcd677e2b6a96db5da54ee4acd3e2e0c01f
font_01_sfnt_off0001067b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067B 11300 bytes
SHA-256: a53433daa9bbd890634229b89308b660d649ab96e4c40b67cd513a6b5a0d9f18
font_02_sfnt_off0001205d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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