Malicious PDF — malware analysis report

Static analysis result for SHA-256 77e6ff556aefd896…

MALICIOUS

PDF

73.3 KB Created: 2021-09-02 06:58:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5164c3ab131652351421d1e9116a2326 SHA-1: 2ccf60a67e13a505e9f9b08d60dd489abd9c0955 SHA-256: 77e6ff556aefd896e39e595ce7444f511b6fc1427d0cb9155634c25615772ec8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pixomot.ru/uplcv?utm_term=proof+of+loss+of+income+letter+template PDF link annotation
    • http://aivieksteslaivas.lv/userfiles/file/57164857865.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081375b202d4---tejakideg.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/97765977457.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/feuun7vg3uq0ogfl6lf4slhmmf/52369036481.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/sevupapusib.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///2021629543264.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/vofizubego.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/28130111917.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/nuzuremiz.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094abce24e33---93305111249.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/b4dd2b8e6a91593c0e061b6d66d8151e/majupaduj.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb19d2e110---fuxufa.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/eqgme01ctqtnhcp9g92gt6pskl/tuxowaparali.pdfIn PDF document text
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/59142051086.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/jasufuwodoxesebarup.pdfIn PDF document text
    • https://edusfera.pl/upload/file/61684747058.pdfIn PDF document text
    • http://plusk-car.com/js/upload/files/87228923687.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/31777317239.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4272713e99---natusigetobobiji.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/65133004444.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/38757088464.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_off0000bdd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDD4 15872 bytes
SHA-256: fab6912c448c751347cbb29c017f82301d46a58f2505681a6381e2a73ecc02ee
font_01_sfnt_off0000e637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE637 10644 bytes
SHA-256: 5b2f32f2d4bccb85543368c3f9bf1a6a6059cd9c3d93b4e202fc4a37fa70c568
font_02_sfnt_off0000fe90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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