Malicious PDF — malware analysis report

Static analysis result for SHA-256 61b3f58be4460f08…

MALICIOUS

PDF

93.4 KB Created: 2021-06-07 03:42:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: e91b326bd8c7a32df7a5d11c9e4e1132 SHA-1: 63fd37fbf8072524377ab2716608a52e8ab712f8 SHA-256: 61b3f58be4460f08380905f62c087de0200d00735aa701c3fb015ae22cb3e693
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of external URIs and the link farm structure are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://wastran.ru/uplcv?utm_term=who+defeated+kanoh+agito PDF link annotation
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b29e19acf21---85518359054.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/0bd39c97d02cd67ec900f28956929019/zipepobepibaw.pdfIn PDF document text
    • https://hanahana.vn/media/ftp/file/moruwotufuvagom.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/bd973fed9c041f22b923566b6fe082ee/kiturorikilewuvad.pdfIn PDF document text
    • https://atl-50.com/files/file/zokasesubuwibetol.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9528b0962c---noxinureva.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/89567283920.pdfIn PDF document text
    • http://atek-ent.com/upload/file/45844006940.pdfIn PDF document text
    • http://bi-acaovo.com/upload/files/gilomewetodevoxuwureji.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16084e7d82ac05---lipebujo.pdfIn PDF document text
    • http://kme-kme.cz/files/file/pobipabifededonusegusamub.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/mh5p7id742eakgtdhne9oe9257/60213914417.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/labixaredokofinulugebem.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607697fc687a2---93210955974.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ed8730396---90489737634.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/6ca45073d4bc6becdf11c526190209c0/lepujov.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9A 16732 bytes
SHA-256: a19ecd20a90baa87dd1f94a6bde84ce480f4428f35c18b1e981282f9755b671c
font_01_sfnt_off00013292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13292 4940 bytes
SHA-256: 56d8d9225a5bc2242a81d24c4006432358476e3bb2369a492400e157e74741fb
font_02_sfnt_off00014375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14375 11164 bytes
SHA-256: 9b690735386e8fee7f264bfb5d3db40e0d0e285966dcacae371d5d0ad97a0360