Malicious PDF — malware analysis report

Static analysis result for SHA-256 97ac4df157245f8a…

MALICIOUS

PDF

140.7 KB Created: 2021-07-01 22:06:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 98d6a843f4854f7561c86d3b253a7c65 SHA-1: 2751f01e6436bc1af15afa0cfa5580b72302972d SHA-256: 97ac4df157245f8a9eb9c8c7ab28fe3701752838605a04454ebe9d625d8a9855
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites hosted on disposable domains, likely for phishing or malware distribution. The presence of external URIs and link farm heuristics strongly suggests this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://medvor.ru/uplcv?utm_term=meaning+of+biosphere+in+marathi PDF link annotation
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160915b3559092---35352055222.pdfIn PDF document text
    • http://staples1981.com/clients/b/ba/ba027a536d51c1d997ee76cae6dc9017/File/62034179344.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/t0dfoh0coh6brvocopna7bs0em/wumisekemubalevodeji.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/42505356715.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8bc5219f0---xaleranefet.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/sp9jn1rcf8tv7h36jsihn9dg34/23441779661.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/8ce5422710009f05b5c085e584b0209e/wefevu.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/2bbd840e028eebdb5d769f3efbe690a2/98001431941.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/wanariselijefob.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/f7b4a462896eb345402a56a96f2629ce/lubidadov.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/5927f70cd5336891dd7ecb6356f659e9/94594689030.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/menugebe.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16079e12af1300---sotavutafoforutesiruvog.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16075af3579478---54206636380.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ebed24192---nedoliserevetaduf.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/5491532001.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7aead352ad---vumoparofozopa.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/4fq6sron7ihcufs5rbag22qb6i/wokosegulenogab.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/9sb0m0k9fujdjgcqr65pv46ond/bijasefiguz.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/88525247701.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16078d309d48ee---zavetoxowite.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/82eadd9f7f2a75ad4536e4bd220a38c9/52517479626.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_off0001c2aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C2AA 19956 bytes
SHA-256: ad5ce49af1bf5a0b2d3e7de290780cf39c52735de462b82bf25918ad2e65865f
font_01_sfnt_off0001f436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F436 10892 bytes
SHA-256: 010fb02c9a4f6583bc3913618d4863c10a55a275cd584cd85f05efdad5c056e5
font_02_sfnt_off00020d03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20D03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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