Malicious PDF — malware analysis report

Static analysis result for SHA-256 2752c8cd4f70e463…

MALICIOUS

PDF

81.1 KB Created: 2021-09-16 12:35:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 39b12a8be4ca778639d1dac0511d9964 SHA-1: 1f304ff6b938a9c716b7a7866fed298830ad3149 SHA-256: 2752c8cd4f70e46335aa63649a7541a6929b03bbf9e0bede6e24fb3a9cada4ee
156 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of numerous unknown URLs reinforces the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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 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 http://cmtl.in/uploads/userfiles/file/file/97767132489.pdf In PDF document text
    • http://galerie45.com/userfiles/file/wiporevudejexawuna.pdfIn PDF document text
    • http://simsvizag.com/contentimages/file/zefetexezokapewudip.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd82f5594c---jijifofudirutepifupef.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16136b35b32738---nonizupufumepenasare.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/xebovavoxupibexenataz.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9a916e35a---lulewuluz.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/84484551934.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f05dc3515a---naxiwi.pdfIn PDF document text
    • http://vita24h.com/uploads/userfiles/file/fakozotale.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210904061031.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/364e6e1f2365de8682f99c6f83a9c641/nobefowuvilumedamufaweju.pdfIn PDF document text
    • https://alpinashop.bg/files/getebuvonebadaxaniz.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/38712385989.pdfIn PDF document text
    • http://www.pvvc.cz/files/72539505391.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/doxilivuz.pdfIn PDF document text
    • https://cosmeticdermatologymiamibeach.com/uploads/data/files/37260598589.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/dejakazip.pdfIn PDF document text
    • http://rabwork.com/media/file/turiranokeroje.pdfIn PDF document text
    • https://sharenkon.com/files/tasojuz.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/99460116815.pdfIn PDF document text
    • http://resheto.ru/users_images/fck/file/9150062551.pdfIn PDF document text
    • https://salondumariagededijon.com/userfiles/file/54756218989.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=stbemu+pro+latest+versionPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EB 17872 bytes
SHA-256: b253a9e3be750d14b0eac3c8e3049e8ac07aba6fb6c0972d292bc348f1743e10
font_01_sfnt_off000105e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011df9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF9 10792 bytes
SHA-256: b986a68b3f3a31e2b6bb2a89c9d88bba1dbc6c9144a1d094d014e3c95bba9424