Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd416c9d96d21ae9…

MALICIOUS

PDF

90.0 KB Created: 2021-07-04 04:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 9bea867f132446f49aee63506ad2e52c SHA-1: 37b592cbea055d0b194c791dbdf182a4d6d28851 SHA-256: dd416c9d96d21ae9fa47bb1522b1211f57b2edc817af242398abc89191a08c9a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm pointing to multiple compromised WordPress upload storage locations and disposable hosting sites. The presence of embedded URLs and the nature of the heuristics suggest an attempt to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://drafthe.ru/uplcv?utm_term=turkmenistan+country+profile PDF link annotation
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/eb493357af34bd10efbaa44707d42376/sizutusovijutavavu.pdfIn PDF document text
    • http://srsheicha.com/uploadfile/file/naguwonatilugaviminewo.pdfIn PDF document text
    • http://webursitet.org/Files/file/nidowewivokuwaxapu.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094316b6d955---49121991531.pdfIn PDF document text
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fufolinolufepimibupunaz.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/28782601065.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d689a2d48b8---42028027953.pdfIn PDF document text
    • http://bigsvatcharasith.com/userfiles/file/15154076775.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/numamizewatowibufipasipux.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f053238ead---desotarevebijifezamikana.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/zajekuzofapun.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/85028891576.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/46148737970.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/94196665690.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16087cae421924---lamodimukenoxujoxelusavin.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609320b99d508---wurikojasafewoluz.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160c4244f2e93b---kijapavuja.pdfIn PDF document text
    • http://abnicum.com/files/file/33006737466.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16070f5b982d5d---37434154088.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/19859687288.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16075e26a3aca6---90565195161.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/103fc1843bbec146b313cc8bddcf8929/15086086326.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_off0000fa03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001121a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1121A 10908 bytes
SHA-256: 7563acb10c5ef250a8ffff19c2541c90064bcf650d2a55f73b88e2923baf84e3
font_02_sfnt_off00012b6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B6B 18716 bytes
SHA-256: 20c00b7638dafc73383bef5f5a61575f31497c8b613cb165fbcb116febace602

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