Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c77cfdb0cdea788…

MALICIOUS

PDF

88.9 KB Created: 2021-06-30 05:01:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 00089974a73871d85f8452a1b0b53622 SHA-1: 19ff2dbe57c4a9db6a409001de8854b388757bd0 SHA-256: 0c77cfdb0cdea7884eecdb295ded3305e38982901e6af0e3c46e9183140fe70c
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links pointing to compromised WordPress uploads and other disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The file's structure and numerous external links indicate it's likely part of a phishing campaign or a distribution point for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://chcial.ru/uplcv?utm_term=band+in+a+box+manual+pdf
    • http://gesundezellen.de/neu/userfiles/file/kelaranawakedolazixiviv.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2e975e84e---82069330924.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609eeac825687---wabuvepaxilagimejirejok.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6a81c0f2b---87567851820.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd4ba2c801---28239310001.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160768c623d95d---83746896136.pdf
    • https://chief-moving.com/editor_upload/file/79991431944.pdf
    • http://sukhabalka.com/files/file/zarabotuvitemufezo.pdf
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/dg7pm1dnb7j1u12r78kp5ipvsb/90143807679.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608218963417d---17107479489.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/9cd1dc586fb09fab350a75edd2d2b046/5837152902.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f57029e169---25260580854.pdf
    • http://mopron.ru/upload/files/zevafifugelivasolove.pdf
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d76d2081af4---galiwodabotisonevisumaf.pdf
    • http://abpaluso.com/upload/file/24094128403.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094db5c55014---borapoxaxubivasidonejisa.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16085744a9c5eb---xonozuboxarog.pdf
    • http://4998horo.gmmwireless.com/contents/files/359190705.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c12988ef0d---kopuremeg.pdf
    • http://hesexpo.com/img/editor/image/file/52349585378.pdf
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/5b6b5d01a7d70991660f9200cfbe9870/45905138618.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/e7ee99af25ce833240f62fef00eb2d1a/tinoduvoduvidowoxuloxix.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3014e4db3---jukuvawox.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/ahoeevq9s3s94ukdok83gnfpha/zumewopatuzafedip.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9cf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CF 16792 bytes
font_01_sfnt_off000111e6.bin
856b0cf727a82d583e7b58eaad129c40626a835ae79a46559e903a711db4525c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111E6 10556 bytes
font_02_sfnt_off0001299e.bin
03c4064e00368af11c9e3e03412675414c7cac380068520ee02192792903ac00		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1299E 17160 bytes

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