Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc8a23a6d4066cf8…

MALICIOUS

PDF

123.0 KB Created: 2021-06-27 15:04:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1a75117a28d5e829e547e0419ccacadd SHA-1: d597017ff2c4dc8166a8bb4c136c973bf991cc40 SHA-256: cc8a23a6d4066cf8da445c5caadfe84e8a301ed2728fbf748bc2449b2306dbab
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics identified the PDF as a link farm, with many links pointing to potentially compromised CMS upload directories or disposable hosting. The presence of multiple external URIs and link farm characteristics suggests the document is designed to redirect users to malicious websites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9651

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 https://drafthe.ru/uplcv?utm_term=agglutination+in+tamil PDF link annotation
    • https://muratay.nl/userfiles/file/rifumelunutamiju.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/28263467542.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606d80d127f3e---gugujeledoxudarejonu.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baae392ac85---lakodoboxunokolijug.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/9238188093.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/kqfdikprvrif5o92iknldf3i7d/52023870781.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/6360783f0193a55b5f0d852355a26025/61360370371.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/85874078579.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6d15c9d47---509392319.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/75013565919.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/fitogawite.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d12fa93683---87633710425.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a51a5ce4db7---32039985145.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/f6f99e10502a902912453ea1ce70c5bd/41551948122.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/hvf5s560li8n28t9i3npfbkhr3/91041551872.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/df2d78aee035b6a2f4c7cd9f16d0ca2c/livedopevane.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/f8d3eff10fb9e35e2dc6e2eb0ebd66d3/tebofafela.pdfIn PDF document text
    • https://tosto.cl/ckfinder/userfiles/files/vazulefepitalifijune.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/vqq1469klv5mvljf3eds1dv833/pixujemumexob.pdfIn PDF document text
    • https://promtong.com/promtong/temp/file/vasimejap.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071af609c119---51879653453.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/u0nurqgg9hms4gb1qs2og7n1d1/tijuwitirexiselesixog.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/luwitoliposojonibozux.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_off00013916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13916 33112 bytes
SHA-256: 1025d5e53a259ffd4a600d88ce0bc4b88e345e250dc21acd46f74d4521a8f502
font_01_sfnt_off00018b7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a38d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A38D 16244 bytes
SHA-256: b1ef7b52ed35dfd01120c19ee4193d967dc828f2fc549fe1a2d8c3c5029b4647
font_03_sfnt_off0001b97a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B97A 10132 bytes
SHA-256: 4ea5d4bd0ce6ae6fbd73d77db820cfd00fef784d71a07a6f9bea90dc812ce74a
font_04_sfnt_off0001d007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D007 3412 bytes
SHA-256: b33a3b28a9407e0ff10493b04327d8076ecbe6fb68861232a02c654741fe7fec

Open this report in the interactive analyzer, or submit your own file for analysis.