Malicious PDF — malware analysis report

Static analysis result for SHA-256 ced32b180f40d856…

MALICIOUS

PDF

80.4 KB Created: 2021-08-02 17:17:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 35831a7eb177dd7498afda9fc8ab2bfa SHA-1: d53cbd78e811a7d3ff5a57ca4e3c22c84b409d9f SHA-256: ced32b180f40d856a280bcc6b15d62089e6e5a4daa2fed53ac2a0afc6eeb4350
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, likely serving as a lure for phishing attacks or to download further malicious content. No scripts were extracted, but the structure and URL distribution strongly suggest a malicious document delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

Heuristics 6

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=cifra+da+m%C3%BAsica+quanto+mais+o+tempo+passa PDF link annotation
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/skin24lge274cue557o6qlmn0e/rolovotoxexupoderuzixuri.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/vuvukis.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/vezufokurokofovopulata.pdfIn PDF document text
    • http://jamesirvinewedding.com/clients/f/f9/f947a18657f5d77a8fcd192ffd4ccf25/File/69261542711.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16093a9563d813---vameve.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc47493387---towilemobigikilegugize.pdfIn PDF document text
    • https://shiokuda2.com/contents//files/54228701389.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c09f977df09---xizudeven.pdfIn PDF document text
    • https://susta.vn/userfiles/file/6059425865.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/fubomemitojogujajupim.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/34649256471.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/57468327425.pdfIn PDF document text
    • https://kaptenhoki.com/contents//files/36572047993.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16078207a77d70---romupibuxo.pdfIn PDF document text
    • http://wshs67rocks.com/clients/9/94/942520bde836a0b401740df6f3d23d35/File/lugagexufufizedazud.pdfIn PDF document text
    • https://xn--80aanugxqi.xn--p1ai/admin/ckfinder/userfiles/files/61043665301.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/68d60eb1f05c82da50c921cc3aa34c73/24794381355.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/80024473419.pdfIn PDF document text
    • http://moristas.com/userfiles/files/kukavunuzo.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/84121271952.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/83618679702.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d43e0e47b4---35627757563.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc1f650dfc---voturatepuweriremi.pdfIn PDF document text
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/30988460625.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/xejorejamer.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5215235711---mujoroxadakikidirut.pdfIn PDF document text
    • http://trungtamdaykem.vn/Images_upload/files/poguvonujulijoniluboka.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_off0000d12b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD12B 18204 bytes
SHA-256: 53d8046ef0645d0d9107e2fdff485ecb41b4afa3265942c29f497dd990f43e63
font_01_sfnt_off0000fe6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6A 11128 bytes
SHA-256: e155561af7be0147e9a05f6c86176c216c6ee96de220210a29b070c9513b02b9
font_02_sfnt_off0001180a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1180A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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