Malicious PDF — malware analysis report

Static analysis result for SHA-256 830530c2bc839783…

MALICIOUS

PDF

83.5 KB Created: 2021-09-18 09:22:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5af110893ae87f9f7a64a7f73d1ddfb8 SHA-1: f47b9a99fd23bf1c43daf41470221073ca0b0442 SHA-256: 830530c2bc83978322b415d8dd680af7c7e452dc5308eb0c9bc7b655ebb8df74
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of multiple external URIs and link farm indicators suggests an attempt to redirect the user to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://crysiq.ru/uplcv?utm_term=how+to+connect+wifi+5ghz+android PDF link annotation
    • http://donghotam.com/luutru/files/45598021110.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/42650007632.pdfIn PDF document text
    • http://dwornawodzie.pl/userfiles/file/safexejilagaxuzixifelovo.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/f7da96d4c572f2d3231a810e087b99c5/digiweguzixuviluzop.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/54575948552.pdfIn PDF document text
    • http://f1-rennsimulatoren.de/userfiles/file/dajarorosuganobifopinuz.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/lonubefi.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/623261538.pdfIn PDF document text
    • https://cobaltinc.org/userfiles/file/ruzativarujisafilesipuji.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/71542688029.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/vimoxedagunikunoj.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/lokeborupufawalopam.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138315313aaa---norabosaxesibibuludu.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131ab8161ce7---sumosotisofuzok.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8c0d33f32---fuvemesi.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408f6ba0bca---79039380113.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/rafufugonakuwularidizipev.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613011474078c---finuzez.pdfIn PDF document text
    • http://tion.hu/upload/file/kilatuxejekudoxowagan.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/3bfef82133a70db0d8881bf58f260882/dilulunu.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/dinulepomefebonurovaz.pdfIn PDF document text
    • https://ra7a7p-h3ba7.com/contents/files/43846952159.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613364b77efc8---95572999694.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_off0000e269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE269 10812 bytes
SHA-256: 1d8ec15f38d2a595367c2cfb73a11f6f5cdb66810d67269d9317517d53a46ed8
font_01_sfnt_off0000fb29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB29 17316 bytes
SHA-256: b72c90682b3e75ae955af2b54dae206d968d18e5167e3462d49f6aeee11802dd
font_02_sfnt_off0001280b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1280B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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