Malicious PDF — malware analysis report

Static analysis result for SHA-256 d126773e2b37f825…

MALICIOUS

PDF

81.6 KB Created: 2021-09-24 11:46:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f1ebede7041997ad1290aeff2f532389 SHA-1: 62afd7cdd42c24a7ce69d4480cca8a3ffad9c3c1 SHA-256: d126773e2b37f82571f7dffd69ea83af7bbb0a9d69997ece0ca1421ec0219ab6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a URL with a 'utm_term' parameter indicates an attempt at SEO manipulation or tracking for malicious campaigns.

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 https://huntic.ru/uplcv?utm_term=toca+boca+apk+download PDF link annotation
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/rrd46pougqf691uop49ov9hgo6/ruvuburaxizijitu.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/zubufedigodevibafezip.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/retukelokalu.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/4415401797.pdfIn PDF document text
    • http://indemo.pl/Image/files/waxarafuzumuvekevi.pdfIn PDF document text
    • http://xn--76-6kca8aqc6c.xn--p1ai/pic/userfile/60898044021.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/8098391566.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/du84ckk7a8fgvc1pm544pn9rsi/fudilijesokowefuji.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161414bce4846a---xazevuzinoboma.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/66117477417.pdfIn PDF document text
    • https://h1t-urlaurora1-turbo.com/contents/files/68808556964.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/67076484444.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613368a794046---wopitarifotejon.pdfIn PDF document text
    • http://bjsddesign.com/filespath/files/20210909163458.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614293b22436b---73336187568.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/ea145ce1a5042a3f65e12dd2c650c54d/71848673971.pdfIn PDF document text
    • http://dakhoanhanai.com/images/files/52841286034.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210923_4A36C49084135834.pdfIn PDF document text
    • http://bjjiffy.com/upload/29137873407.pdfIn PDF document text
    • http://rts-3.ru/upload/files/xetifuvuwigevunigeboban.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/51200246543.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/gutamokav.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021092013350018.pdfIn PDF document text
    • http://bakoca.hu/files/file/11886851961.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/12664544170.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/modutona.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/begutebewig.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_off0000da0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF223 10196 bytes
SHA-256: cf99a2254f4932f49ed7f403759fd41ec301157dd0d5d7e0fd17ce482cccee80
font_02_sfnt_off000108e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E9 18356 bytes
SHA-256: 8d896db8e899113ebce0b740303148269810762ba2bd59f9b3451a80e7c7f62b

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