Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aa97c3ba6b6dc2d…

MALICIOUS

PDF

78.8 KB Created: 2021-08-06 18:06:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d4cc37bdf8ebc56d89253b2163c08051 SHA-1: 42a1b709cb9a4b520e2a2b24a66ac0e059d16d28 SHA-256: 3aa97c3ba6b6dc2de1b500cb8fd83c915965d332380e9897065b49e949905536
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It functions as a link farm, redirecting users to various compromised websites and potentially disposable hosting, likely for phishing or malware distribution. The presence of numerous external URIs and link farm indicators strongly suggests a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://shophouse.info/images/files/nobediposebexidutonaso.pdf In PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/f39e3a880eb2387c129a5d731c8d7302/dukadefabojoga.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/88774417616.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/itfa3s8dq07sco4tokelof165f/fitogojosugatavaxaz.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/fojud.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/45345004599.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7865e6169---guvinasepixigej.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/jiboxasifulejimazer.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cffaf7aa27---68332195348.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/julukiwas.pdfIn PDF document text
    • http://mankatomnclassof71.com/clients/e/e0/e0e8961458839910853a12af65841b27/File/solawo.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/95108962395.pdfIn PDF document text
    • http://gaziogluenerji.com/images_upload/files/sovofibuxik.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608b64cf3d2c5---bukoboseritavenezilo.pdfIn PDF document text
    • http://mopron.ru/upload/files/kusofivuvovasabozebi.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/2ee4deff80a1688428e8d53f74bbb412/gegitezidewerumigel.pdfIn PDF document text
    • https://combrooncom.com/contents//files/97210556700.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/58770347418.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160873481427ad---63034166032.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160768fcaa2019---6172579703.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/vosiv.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/7653311693.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085cd486e79f---wojanisopebezisololezevox.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/65772416676.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/82514724613.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=lego+mindstorms+ev3+robot+building+instructions+31313PDF 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_off0000c949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC949 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE160 11040 bytes
SHA-256: 6e2d4ba9c86483e3b9bebd45e3e3190b4f324c9901ca2c9455a0de41028cd72d
font_02_sfnt_off0000faeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEB 18280 bytes
SHA-256: adc7b24c125417b8fd64b563884b657b375d33cd8d093367715ebc7e7176f3e6

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