Malicious PDF — malware analysis report

Static analysis result for SHA-256 9223d4665a18cfb7…

MALICIOUS

PDF

87.4 KB Created: 2021-09-08 22:55:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e53b36762e3872caf56531c3e6bf9c44 SHA-1: 7e16f0eb82cf48e052a6e8c0b70a64de89c4b140 SHA-256: 9223d4665a18cfb76327ebe96e689ecda7b12569d93503d26be5944f779180f1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of an advance-fee scam. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the heuristics clearly indicate a phishing lure related to lotteries, prizes, or parcel deliveries.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://krisoc.ru/uplcv?utm_term=memo+app+for+android+phone
    • https://s-serviss.lv/userfiles/file/39547307343.pdf
    • http://orthopediedelft.eu/files/31678138909.pdf
    • http://www.vljainandco.com/userfiles/files/tesumaselane.pdf
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/godebolamuwuwavesimejun.pdf
    • http://gidaero.com/upload/fckeditor/file/30941458669.pdf
    • https://whatproperty.ng/ckfinder/userfiles/files/zemobefaxanuzopaz.pdf
    • http://gespk.com/userfiles/file/55006928183.pdf
    • http://laclonghotel.vn/upload/files/boromajulonevegawa.pdf
    • http://mylodge-naoshima.com/poxopoxikubopasevag.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c121c8164---813168107.pdf
    • https://dottoridegregorio.it/public/file/76773975156.pdf
    • https://gifarlcm.com/upfiles/editor/files/80158531967.pdf
    • http://www.allatpatikapecs.hu/images/file/pixof.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16135f558ddef8---fezezasokexoneb.pdf
    • http://moscowprice.com/content/xuploadimages/file/79087397309.pdf
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/1f08770f9cc05cc195790115f7264ee9/namujuxepejevoj.pdf
    • http://tw-tms.com/uploadpic/xw/files/fipumedovitudilefi.pdf
    • http://kpghomerepairs.com/uploads/image/files/zurosesuzitepumijemidimup.pdf
    • http://kossuthdigisuli.hu/userfiles/file/15788302046.pdf
    • http://zhjpharm.com/upload/files/85416743969.pdf
    • https://cargobull.cz/res/file/fetuxolikuzojiginuwoxeli.pdf
    • https://ph2020.org/FCKeditor/file/70804905544.pdf
    • http://archiw.bibliotekalesmierz.eu/img/upload/files/jefele.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1c4.bin
b9722a4c637bf99f5e94f82a8e32ea4efa2f5b1fb8441d770f66999f5f2a5e03
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C4 10444 bytes
font_01_sfnt_off00010929.bin
26720a2eae2fa29e871434a1d63296ce567aadad895c311217db46651085544e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10929 17988 bytes
font_02_sfnt_off00013807.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13807 16792 bytes