Malicious PDF — malware analysis report

Static analysis result for SHA-256 d908364d66ee6071…

MALICIOUS

PDF

88.4 KB Created: 2021-08-11 00:09:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ffd15a5d3b55aab9021b09a546a584bb SHA-1: 81b14e07ad882f735e75f83ea2a07dcd2bcfb319 SHA-256: d908364d66ee6071bc9f7dd57ec6fcba8964e7794932d827ab160ff1fb089931
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of embedded URLs and the overall structure point towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://coretry.ru/uplcv?utm_term=technical+report+writing+today+ebook+10th+edition+pdf PDF link annotation
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/8090685e33bf0253424346daebf994c1/74729952512.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/86880861535.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/74560260084.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/notuvoso.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/muxon.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb2afef6d5---55485708059.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/78501770606.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/womiwazededunumumimog.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/02f7d44e1331f29bda24f0a673cd9c23/95690587242.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/952uctgaj0fngbrmf18itpqis6/7358794833.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/27a6dd24e99a38d9e3664a92584200f6/mefigelurakidebarewo.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baed2b2525f---pepakefifejiwiragaxa.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/e8f15ad206950245d0d90cbf66a3259a/26529661238.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/sofararamafa.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/rirubisataxapolewi.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/hb7eqq9lqkgh1bll8kuo576q63/juxokulo.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703fed7babb---15292660583.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/8968b23b73f9323ef5642026bd8c390e/fovij.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/32703765556.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/kidav.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16073ac4a54b31---judaxi.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/92773118857.pdfIn PDF document text
    • http://quinta.cl/upload/files/40150340080.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/meniradapufatuwurag.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_off0000f4ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EE 16528 bytes
SHA-256: ec4ba94a43dbe50d763c0068fb393366e91eaa0ee5e21506fc649adb63b7d030
font_01_sfnt_off00011fbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FBB 11300 bytes
SHA-256: f091c6b21ae0b408eb2e28226fc70811ad37eb9de5d611051df24ed00224bac3
font_02_sfnt_off000139e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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