Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4180a522e9a6e24…

MALICIOUS

PDF

83.4 KB Created: 2021-07-28 12:13:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: db701361e534e356f42f40b393101753 SHA-1: 3993ade40fdd710ae41ff91816e86800311276d1 SHA-256: e4180a522e9a6e240df60f32563b3ff78dbacd06e33663cdf0c96f161054f1bd
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The file's structure and embedded links are consistent with a tactic to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830d17a6c9e---92322584985.pdf In PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/7330181220.pdfIn PDF document text
    • http://yalcinsezer.com/upload/ckfinder/files/jogugebefajoxizu.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608f667ede66b---32852360650.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609227c45b257---sazegininujasiluzufeba.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/gerageluril.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/7637645477.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/lunalafugi.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/31642966712.pdfIn PDF document text
    • http://cungcapluonech.com/upload/files/34386789132.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/60548674986.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/55768397233.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/2k4nog34e3fj8h6civp703n7mk/35173062431.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/90501119688.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/ennbe8ddglii6jsgor9rgemtnd/xatixidofe.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a53a9f7f87f---gidagebalobapizokafisok.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/eb772e62644bf25767e4c582e100258c/50231454877.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/bovotibizuj.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/01f9d69d9edbf36bc4198d005b09b219/71792287293.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607f293c2db99---23741116273.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a36b8838dad---89225628061.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2dac84c1cf---wupasamemafa.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160adc26a260f3---44948278197.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/75df5bbba89491f5bc064027061fc88d/48612977045.pdfIn PDF document text
    • http://aifamilyreunion.com/clients/59202/File/gefolozomikoduzovelako.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=ense%C3%B1anza+situada+frida+diaz+barriga+libroPDF 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_off0000ddf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF5 18320 bytes
SHA-256: b4b81f8518b0e22314c9204f32047f32407ec488cef46c3e65e9fb6c5502d5f0
font_01_sfnt_off00010b0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12322 11016 bytes
SHA-256: e09848d2b40f0802d31d3092ab1f63f4da980d4ddac07a34f8fb060f82802903

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