Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cdde6c11609f0cd…

MALICIOUS

PDF

72.5 KB Created: 2021-09-25 06:50:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bdda151423fbc2c419a5a10a7e72a942 SHA-1: 532a43f7dfef149831270707760af9443191a5a7 SHA-256: 9cdde6c11609f0cdd4f77d758e96de7f81e2f35d45cb692e297ccb5017e4da83
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous external URLs are embedded, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The PDF structure and embedded links are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://huntic.ru/uplcv?utm_term=network+cell+info+lite+iphone PDF link annotation
    • https://suthuytinh.com/app/webroot/uploads/files/77367915157.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/feveramemewu.pdfIn PDF document text
    • http://azstorestudio.com/uploads/files/61107727888.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/zarilugix.pdfIn PDF document text
    • https://drjou-vc.com/upload/files/11005019863.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/jodadiginadi.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/48130018321.pdfIn PDF document text
    • https://noventa.cz/media/files/file/49570420264.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147256baa61c---demufejanaf.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/d0a3dca395bf482ed3c3d2dca42835c4/fofikemudesagonawivo.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614450602712e---34304641669.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/25944849624.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/89855327675.pdfIn PDF document text
    • http://www.pacautomarketing.com/file/78797552902.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16149748ce9b6c---74930797990.pdfIn PDF document text
    • http://ryanoomen.nl/uploadimages/files/54001397208.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613266a6d39c0---jamorulifilitavobi.pdfIn PDF document text
    • http://www.facyt.com.ar/ckfinder/userfiles/files/noditexorumatisiloriga.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/vumalejuge.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/68814075788.pdfIn PDF document text
    • http://petrduchek.com/files/nilizijamutotisafimonumo.pdfIn PDF document text
    • http://tko.wavedev.net/img/files/files/46217427346.pdfIn PDF document text
    • https://ksboutlet.com/file/files/bizikifakemu.pdfIn PDF document text
    • http://cz-synergy.cz/data/file/88009257960.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/25d60b18c835b362dfb5f166a6356b47/57232387825.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_off0000b4c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD9 10404 bytes
SHA-256: 7d3b671e50bb4a9701e1d1581798e92aed89278e23b5c4a77c8846536b849a51
font_02_sfnt_off0000e453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE453 18656 bytes
SHA-256: 61f8e61d2f684a7313292449a52bdc6b1bbaec01e520252317195d145170c932

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