Malicious PDF — malware analysis report

Static analysis result for SHA-256 d636c281a23fa779…

MALICIOUS

PDF

80.3 KB Created: 2021-09-17 21:45:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7ab484ea62102b5f8e378e6d703b571b SHA-1: 26c7a69a56a8e6a1a0876717cf8cddd126a08863 SHA-256: d636c281a23fa779912fad9a1de6f7db9e77cfd5d7ca995b002bb9517a96a082
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' reinforces the attack pattern of using compromised infrastructure to host or redirect to malicious content. No scripts were extracted, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://catamma.ru/uplcv?utm_term=eclipse+download+for+android+development+windows+7+32+bit PDF link annotation
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/26087is62lqo3qa3oqigodkb23/75604565405.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/xepufofixosene.pdfIn PDF document text
    • http://www.s-prom.si/fileupload/file/7176726205.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/wozitakenovuzog.pdfIn PDF document text
    • https://sierrainstruments.cn/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/susunedazitafetuminexu.pdfIn PDF document text
    • http://e-store-sys.com/userfiles/file/takagi.pdfIn PDF document text
    • http://xn--h1aeekk.xn--p1ai/files/file/jetawunazipixobofewukonor.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/gedulejefakuj.pdfIn PDF document text
    • http://hindustanadvancedsolution.com/t/tutorfirm/uploads/ck/files/45314107609.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8e712853a---26127411689.pdfIn PDF document text
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/xometexurewubigapigoteso.pdfIn PDF document text
    • http://putzlappenborner.at/editor_up/69157002446.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/51168745147.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/5e86f220ee3ee0104fa48e7ee76cdda7/34017657240.pdfIn PDF document text
    • http://china-miyaco.com/img/file/20219912547.pdfIn PDF document text
    • https://quangtriasianwindow.com/uploads/image/files/fuvijusixodikiraxujatobu.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/2021916352397892.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/36169640518.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/vepekimipexulerusemufeg.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/6f80636a14a2aeca97552da00e2ac4b9/kitinogegotapuroxofa.pdfIn PDF document text
    • http://westhollywood.ilovepokebar.com/uploads/files/kagexuganuvinixuti.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/63f9e2223ab4969d5a0556f9fdb6e697/xepos.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/83572457551.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143a7ae34fae---42083537944.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/tutotarimo.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_off0000d5f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE09 16328 bytes
SHA-256: 4263c6e77a9fea3bc957d86bd2e9543862cf101ddf2261b28e49c2dcdefb9250
font_02_sfnt_off00011842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11842 11396 bytes
SHA-256: e26462254790a94d98a46ec9d94e9940d3ba2361b9c39222d554baa08e75ecfe

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