Malicious PDF — malware analysis report

Static analysis result for SHA-256 327c24e7be3d0b84…

MALICIOUS

PDF

88.9 KB Created: 2021-08-20 13:11:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cf7ed03dd947ff883e6dea19389ab243 SHA-1: 8f702da184def0d3ab2c0e8336a2c3b75ae55aa2 SHA-256: 327c24e7be3d0b8498abf8f84a7c86a48deee611065f301abc180f663849be9e
204 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including random and compromised CMS upload links, and a link farm on disposable hosting. The presence of a 'download button' lure further suggests a phishing or malware delivery attempt. Although no scripts were explicitly extracted, the overall structure and URL patterns are consistent with a PDF-based downloader aiming to trick users into retrieving a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=gun+war+shooting+game+mod+apk+revdl PDF link annotation
    • https://resulgame.com/calisma2/files/uploads/jajutobagawakibabesiridug.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/7e30b572iffk01525eadavrj60/mosaredetuf.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/20434096498.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/suwalilaxidosutofomuwab.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5b2f68fea---vovutajurefina.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160960c1a9fff4---36463133771.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/78356881719.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/bonefataxafedivex.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/24730477061.pdfIn PDF document text
    • http://email-database.info/userfiles/file/21951169054.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/13503742167.pdfIn PDF document text
    • https://vestol.bg/files/file/60601109297.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/0fc081d0bf72b555022e65c3f2ed5435/fiwekexefonolixez.pdfIn PDF document text
    • http://sivam.pl/files/file/61824620868.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/599972107.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609776cf7d776---81259483939.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/14378976256.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/50649780952.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/51e045ielvrbm0kkh58sefnoae/wagudabezijomid.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/4258106887e637d479207817deaa0dbb/93221106822.pdfIn PDF document text
    • https://infosantiere.ro/userfiles/file/86600410244.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/5e4ecce864787b223a5fd32996af2b7a/65221689953.pdfIn PDF document text
    • http://hornets88.com/clients/56662/File/10754872189.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/f5cf8fd0e0f5d83e510bdbb84cd455cf/xotokuzejeretaden.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d69c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69C 11220 bytes
SHA-256: f655832cd80604054773375ec3c24098b2fe46c8a29987eb78e490dcb9bc9ce5
font_01_sfnt_off0000f099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF099 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_02_sfnt_off000105da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DA 17492 bytes
SHA-256: 6c63532a9e0fe6ca07f1cce6c6b6db49c6015e5477bf173df0849c6ee1a610f0
font_03_sfnt_off00013389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13389 1636 bytes
SHA-256: e3a1ca7fbcde87b6e2bc585668cff1a50452d2a09c95c546c16e9f90aebd6500
font_04_sfnt_off00013b5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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