Malicious PDF — malware analysis report

Static analysis result for SHA-256 98fda9a60e32902b…

MALICIOUS

PDF

68.1 KB Created: 2021-09-24 22:24:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8ceba2faa5553b85324b1a98a6a5f769 SHA-1: 9a741d35a1fdf132f40b015c7716ae892a81ee14 SHA-256: 98fda9a60e32902bff22356b33e21a2597aa4c9bf8662e4bfd05f859dcbbfb37
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous external URIs pointing to compromised websites. The heuristics indicate it functions as a link farm, likely directing users to phishing sites or further malicious content. ClamAV detection and ML classification strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=atomic+size+of+alkali+metals PDF link annotation
    • http://nguyenthaotech.com/upload/files/bizarurelado.pdfIn PDF document text
    • https://matratva.in/userfiles/file/1762860916.pdfIn PDF document text
    • https://jmclimatizacionhvac.cl/images/subidas/file/55292950380.pdfIn PDF document text
    • http://wellgroup.cz/UserFiles/File/miduvewutovafoluvejaf.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/dixesexuxasoki.pdfIn PDF document text
    • https://xcheck.vn/uploads/userfiles/file/38404433105.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161302370e560f---69498472447.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/71930177857.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/bokixa.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/c3g2p9a24dq5ampghihc0vsr61/xuxedojubixokav.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360620205fb---21984769659.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/98903920181.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/resikopatabewen.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/susozo.pdfIn PDF document text
    • http://reckdance.pl/userfiles/file/xelalewipamaneme.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/kexovetixomegovavowozuro.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/lovatoxubidimew.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/89754581056.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/84078947649.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/dakiji.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/585566706.pdfIn PDF document text
    • https://camphacement.vn/upload/files/vibadojazobure.pdfIn PDF document text
    • http://uniontsg96.ru/admin/ckfinder/userfiles/files/bolasunifobopofugipez.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/gupuborukexijufufiruwa.pdfIn PDF document text
    • http://srilakshmienterprises.net/uploads/75580365161.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/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_off0000b247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB247 15400 bytes
SHA-256: eaa77f4f32e9dfc764c2babb3cd5a034a2994795a799f41f4a8e6bc8bbfb6e02
font_01_sfnt_off0000d98a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A1 10424 bytes
SHA-256: 17e20f68f7399317a199d122bd62f2d87838ab5b52b32fa6e24d4aeac66953d7