Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddc77244747a95ac…

MALICIOUS

PDF

97.1 KB Created: 2021-08-20 17:43:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 823f41aecdb908a313a289e6dd6449f9 SHA-1: aa0a4baa1eb08c97b05c91653b1e931b20ac1b66 SHA-256: ddc77244747a95ac6da2891f31dcd9ceda4b887b36d3e026c21bbd383dd03fa9
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malicious redirection scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to malicious content or downloads. No scripts were extracted, and the document body was unreadable, but the link farm structure is a clear indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://queure.ru/uplcv?utm_term=acid+base+solutions+phet+answers PDF link annotation
    • http://12shio5.com/contents//files/dabobovafakup.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2b744638f---guzewemegaruwe.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609f84dcb9552---35827875699.pdfIn PDF document text
    • http://e-hematologica.com/users//file/45105810610.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/tatuzo.pdfIn PDF document text
    • https://festival-bg.com/media/ckuploads/files/10849428944.pdfIn PDF document text
    • http://12shio5.com/contents//files/31795325303.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609834db9f227---vuwimuloj.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160f6532f1860c---rululejogusuwus.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/27a763fab9d7ded5e014002b96905394/74472099153.pdfIn PDF document text
    • http://carefirstwalkathon.com/clients/8/89/89514deb4c0e8807eb046cac28c4977f/File/fimabugeweja.pdfIn PDF document text
    • https://safe-international.com/userfiles/file/51706060635.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f4361dd92---51243498725.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/19275434660.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/oihi6rtqo9f4b5d8maka983jlq/75682573339.pdfIn PDF document text
    • http://dbhsreunion.com/clients/21010/File/molixa.pdfIn PDF document text
    • https://medpressa.ru/files/file/17841245295.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/gidisano.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/fb139e748f70c16eb34e882e7e61f43e/90164419386.pdfIn PDF document text
    • https://efnnma.org/files/file/81153952363.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f40e941ecc7---76746475585.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de4d9f73b83---kilajenunema.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607a42067dfe1---rujuwutunekawijog.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/891s0btbpijs2i5ugvfb2bo7tu/53087491953.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/20522794358.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/b1055fed3d369b21fa7305526b8b5f12/34725610787.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_off000115a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A6 10916 bytes
SHA-256: a1ba9f3007e74b3337e7e268ae59e68b4d2e76dc504dcd0391d56b8cd1e5ca03
font_01_sfnt_off00012eba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EBA 17896 bytes
SHA-256: d4995dbeb497780c40c1211fe81dc2041c7e687996849c9a4caaca64b46eacc5
font_02_sfnt_off00015e11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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