Malicious PDF — malware analysis report

Static analysis result for SHA-256 d169d3cea10a13ff…

MALICIOUS

PDF

81.1 KB Created: 2021-09-08 23:31:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 57a6edce4e4dfcd26c2c68372545b2ee SHA-1: 68426ad65c3d58209e79699cb098cf65193774ac SHA-256: d169d3cea10a13ff7e807533b86f3ffb2b31456e071a8c53671452c1f6c05cc5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many hosted on potentially compromised or disposable domains, indicative of a link farm used for phishing or malware delivery. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple PDF-specific heuristics related to URI and link farms further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://chcial.ru/uplcv?utm_term=watch+shows+on+android PDF link annotation
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/41012333740.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/puvoximorivi.pdfIn PDF document text
    • https://shidoremicrosys.com/media/81707966475.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/43672623949.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/sepexatategowegobasina.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/tiremitoxo.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/jexabixarukir.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/161375ee371522---jiruforifemizetukaj.pdfIn PDF document text
    • http://goodlack.cz/userfiles/file/zesunufulejifabi.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/tezulenin.pdfIn PDF document text
    • http://yurisolomko.com/userfiles/file/wudokobubuligopaj.pdfIn PDF document text
    • http://utpcomp.ru/uploads/files/54629703186.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161304ab006318---nubife.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210903_E3986868A82B4981.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/8abb3b3f4606c7f24e3678d886612576/98564894879.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/763ebea5aea2aac9ffa4fa2441bbb243/zogejubusigepiwejuzaz.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/68363588744.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/varuvamixul.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/67676183799.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161373c49aa13b---mimukufatuzavonu.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/xuzudilugosepajupisit.pdfIn PDF document text
    • https://sanaspinler.net/calisma2/files/uploads/24731521555.pdfIn PDF document text
    • http://privateeducation.sg/verzsape/demo/upload/admin/files/diwulaletozidojazo.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16138e55e299d2---74259879635.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_off0000da17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA17 10368 bytes
SHA-256: 2b3322afb06c3b4bb6ab0b2d26e05ddfa66864a6bf02bcad99869a99d90e1238
font_01_sfnt_off0000f188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF188 17636 bytes
SHA-256: 4bf9bc5d1da94218ce0dd06f17cc5caca1887fdfe57795d8ff73fdee6a9e304e
font_02_sfnt_off00011f4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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