Malicious PDF — malware analysis report

Static analysis result for SHA-256 e01787a3eeff65c0…

MALICIOUS

PDF

120.3 KB Created: 2021-06-29 08:50:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 80d8bf6e8d7eae451f88ef7bd68314e1 SHA-1: a93d74c7bdd2eb9995567469b05331f3f966f45b SHA-256: e01787a3eeff65c0fa5c0fac1af0bfdabde61ac5f42f6433883eeee6b2dd7923
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to lure users to external content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the URL structure and heuristic firings are sufficient to infer a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9691

Heuristics 6

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=discord+channel+name+font PDF link annotation
    • http://aj-logistics.com/stock/userfiles/file/difefosotonixosi.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a39cb0844---reledutat.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/2e19e264e07e48dc36cbe8ffc35cc9e8/xamak.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0b9ca5997---batotawotosekina.pdfIn PDF document text
    • http://hkacca.com/userfiles/52797664616.pdfIn PDF document text
    • https://atrax.hr/files/96137105223.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092829a39b12.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/14626952195.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6140034679---jepetobamedewizuj.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/ad49d4240fca034a603e15b90a29d609/18305722308.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b44391de574---minixogulejewunivotutemo.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/9098ba646ccf4b17847eabf203b45796/64632139843.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/953b75a5d052c2f77db0d64375d74874/58442913265.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/hdor5s0pgedt9hdddvt8inv1ea/59508301701.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609b12319f940---49169938014.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608918226c548---72989158783.pdfIn PDF document text
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/ef0207126b37c6957c613ddf40b5b85e/mosixesosi.pdfIn PDF document text
    • http://flexa.cz/docs/file/tajazijirokuzi.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/3a6016778a96e1d2f2ea0291ec7fd7d2/razijojojoriwaz.pdfIn PDF document text
    • http://www.netcorp.hu/data/editorfile/motaliwa.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c5fdaa32a---wenikabenorezesumowu.pdfIn PDF document text
    • https://altbuket.ru/files/jujisinerezasegejolewula.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608212efa9f0c---wipofu.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000143ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015bc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BC3 10740 bytes
SHA-256: 598688148fc924df13f85b33e94cbd115681ced3be66baf2ba4bad405d7e1d6c
font_02_sfnt_off00017437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17437 17344 bytes
SHA-256: ed1d66220ca3a9f6d8ff3421cd5b7ad16f535ec557df8ea4fe6c9155e153850a
font_03_sfnt_off00018dd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18DD4 21808 bytes
SHA-256: 78c6358ff12a2dd0f9fb9d8ed7be35411961441a2b0f0363e8d2172d272fd800
font_04_sfnt_off0001c919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C919 2348 bytes
SHA-256: 716dc0274771e496ab88e535c6138065d11b5c8c2f91578c18c9cfbdeb277ff7

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