Malicious PDF — malware analysis report

Static analysis result for SHA-256 c24a5bc749d2c8e6…

MALICIOUS

PDF

103.8 KB Created: 2021-08-14 00:52:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bc13dd4ac98468e616083736b2211364 SHA-1: 6a8220640970af1e51312fac6c82cc872f2b8544 SHA-256: c24a5bc749d2c8e62bdf82c59c23b7f7a7f39100e44a1d234841c640a06198b7
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised websites or disposable hosting, indicating a phishing or link-farming attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to malicious content or downloads. No scripts were extracted, but the structure and URL findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

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://agroadvanced.com/app/webroot/newsletters/editor/files/dexezuk.pdf In PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/39234920402.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/60534443611.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/jawusubapilopejeke.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/pamevu.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e6555186d7a---20046264657.pdfIn PDF document text
    • https://ciar.vn/uploads/image/files/46267358464.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d2fc6681b---xemaz.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/51da551a6b19e214d624bd1a34a4cde0/39868390162.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d3d52d115---rudupodoxadezovusewexivar.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af63916306e---77824283766.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/91205863356.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/58142681808.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf3bc66dd6---livawapuxajuxajuda.pdfIn PDF document text
    • https://bio86.net/fichiers/pukunavuxitu.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/sufodaxisif.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/tuzupopokis.pdfIn PDF document text
    • http://greenbrier101.com/userimages/90908301628.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103bcaed98b4---mevupuxunetuselumoz.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/pogonodebipipepetos.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/3444c8922f81aab37f5f8bf7d99ecb58/lugaleworaradovudutegizut.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210616015310.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/zoxajoko.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/cbfm907ojtm9na018jp3u51oe9/72875975592.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/rixifupisodurizu.pdfIn PDF document text
    • http://goldmustang.com/files/files/bojotimadawipo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=autodesk+inventor+professional+2018+manual+pdfPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011bf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF2 11400 bytes
SHA-256: 98b5e0d4e7572d3cdbf1838af36783b704378f280e2705eb77ea77a12ba51455
font_01_sfnt_off000136f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014f03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F03 19344 bytes
SHA-256: f7f0946c262e1389a7112d102a5e431c448167a8f8b6146c5d1a61e3dfa9db5c
font_03_sfnt_off0001807d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1807D 3464 bytes
SHA-256: f1689a018e6ae99f249f3c664fde0f3027365bc5161c29e1eb2f008b024335df

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