Malicious PDF — malware analysis report

Static analysis result for SHA-256 15f454b10e9cc3f7…

MALICIOUS

PDF

85.3 KB Created: 2021-08-14 07:22:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c4556d26a24e866c3a2ab8be6ca2cc1f SHA-1: aa41338265930127348c5c0fffc13796af5e266c SHA-256: 15f454b10e9cc3f74b88c24bb2e242c6c305c73cefb86d1f09e9ccc2702fa8c7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external resources, many of which appear to be part of a link farm hosted on disposable or compromised domains, suggesting a phishing or malware distribution attempt. The presence of a 'Fake invoice / payment lure' heuristic further supports this, indicating the document's content is designed to trick the user into clicking the malicious links. While no scripts were explicitly extracted, the PDF structure and link farm indicate a likely attempt to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://archism.ru/uplcv?utm_term=how+to+improve+fixed+asset+turnover+ratio PDF link annotation
    • http://graham1978.com/clients/79565/File/nojoresujakifuxi.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/32807860057.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/pasup.pdfIn PDF document text
    • http://www.conectadoscomdeus.tv/arquivos/file/fajiludom.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b67a84d7a---11791754911.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/betelusexumo.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/vefinibavidetuweki.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/160f414158985db836720a4d468deb54/65166116004.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/46723834070.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/faxesigokemufikus.pdfIn PDF document text
    • http://evola.it/userfiles/files/49328323902.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/zasor.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b327a021021---34350737572.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/vsk7epmuvv1bmu3oai70qbrvu4/zotiro.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/h91soi9fijbtacmspk06abu2qe/jixikukel.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160721164aa038---2304295993.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-4/20210504164957476131.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870dff4192e---75481539481.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210806071042.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160983a2aa34e9---genofakab.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/18944011835.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/sexumakuvurulasowalova.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/61439465543.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210614163446.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_off0000ead7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD7 16356 bytes
SHA-256: 4b730a1f343a6094a3426bf30b7a0f4114e633e67991c5519bcf97fd0c67646b
font_01_sfnt_off000114fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114FC 10956 bytes
SHA-256: a2b4187475731e8c2d155bc0daeb4e02fd168b543aa23ebf2f3d54c0a256fb7b
font_02_sfnt_off00012e74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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