Malicious PDF — malware analysis report

Static analysis result for SHA-256 cda2dcc023c2eee9…

MALICIOUS

PDF

82.6 KB Created: 2021-09-10 21:48:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f57d5f9886a0780e0113820d6f86fda8 SHA-1: b9d9a0ad4509d5aa5f6bceb1b54284f179adbd76 SHA-256: cda2dcc023c2eee9c38769bc1a6460854d46fadd7115c44d9b8d2bb6a2636f1b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm patterns, indicating a likely attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing lure designed to download further payloads or lead to credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=wrestling+apk+mod PDF link annotation
    • https://ekoelprom.pl/public/images/editor/file/12379022035.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b66f34f89---51840037555.pdfIn PDF document text
    • https://akconta.com/uploads/files/terixisarigivu.pdfIn PDF document text
    • https://hsdinstruments.nl/uploads/files/vopotupijivun.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1pv1o5b58re44ig0mhu5od6gn0/52235975323.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/simaduletufepajurumavukor.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/sovarapunimatedewabit.pdfIn PDF document text
    • http://ihdbd.org/upload/files/80146818408.pdfIn PDF document text
    • http://reckdance.pl/userfiles/file/domufefuzot.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/tesuwifijaxo.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/36526232565.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/fonad.pdfIn PDF document text
    • http://nkmate.com/FileData/ckfinder/files/20210901_BA9DD8FCCDA990DC.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318486ec0cc---vufaxuxivanuwugazupapi.pdfIn PDF document text
    • https://ssekolkata.com/ckfinder/userfiles/files/89864311280.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131bd2f50616---75355876191.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b894dc9bd9---nixifubitebemonodidoviruv.pdfIn PDF document text
    • http://gmtshipping.com/attachment/file/89958554291.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/9090a6d7c3e0f0ef789a3ce8f9165cad/30486503789.pdfIn PDF document text
    • http://elitvorota.ru/f/file/23534918326.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/32624141354.pdfIn PDF document text
    • http://magdrywall.com/project-new/christianbook/upload_images/file/furade.pdfIn PDF document text
    • http://nato-denkmal.de/uploads/file/towusowozidodi.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_off0000dae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE4 18716 bytes
SHA-256: ab0531f58c82718c11a6f2fa6135dc8b24a1b21babff1e5483a5a235ccf2efbf
font_01_sfnt_off00010bcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E4 10820 bytes
SHA-256: 20d477c30692a8b1bfab25715677e83c248f8687d3c22cdb640dd115c1df86f4

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