Malicious PDF — malware analysis report

Static analysis result for SHA-256 aca81afbf1c30c1f…

MALICIOUS

PDF

79.7 KB Created: 2021-08-27 01:03:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6a9b8388c72debc60c99a583367174f4 SHA-1: 32aa3119ca01a624bb7f5dd0b15cd9cfa34f130a SHA-256: aca81afbf1c30c1f61a8d74e25d9471f6a33f17694c1fc948b8aae911d992fe1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous external links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm or redirection mechanism. The presence of embedded URLs and the overall structure indicate an attempt to direct users to malicious external sites, likely for phishing or to download further payloads. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://emanuelarombiarchitetto.eu/userfiles/files/86603793486.pdf In PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087bf3a0004b---9416636282.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160793db18cd8d---gadufovewesulazamejabized.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/60304952809.pdfIn PDF document text
    • http://napiarsaigh.com/images/runejinifama.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607c42733336e---zagud.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16123cb47a942f---97433950171.pdfIn PDF document text
    • http://a899.net/userfiles/file/lajizimomap.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611dfbd0db4b2---36415206384.pdfIn PDF document text
    • http://dkyangmei.com/uploadfile/file/2021072808594573499.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/d88b6cc2d9f1d79fa0f8a3e9a0df205f/39046784932.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca673eab8d---mirix.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/mukukuw.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/fa1d77ee926c5df13efaf369da2f6993/27161860276.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e96dabf26---26158019052.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/wibosobowekibu.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/099h26n0ut9u5cop8djeolibm5/winoviwigivakodozar.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/88856076490.pdfIn PDF document text
    • http://fitviewer.info/files/file/vugarobemen.pdfIn PDF document text
    • https://pasarantogel.com/contents//files/92944271069.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/nenujiluriruzulosinagow.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/fujedirebetonofa.pdfIn PDF document text
    • https://mimpishio2.net/contents//files/56979570108.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1606f14d2055d3---1949857704.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/ect0917vp53rrnf7lajodc0ak4/82252992902.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=danny+pino+law+and+orderPDF link annotation
    • 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_off0000d4b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B1 17124 bytes
SHA-256: cb1e3a2aacd0891588873cb4327e8d7c2c06a10389dcf4f388a9d9f434bc9e6f
font_01_sfnt_off00010177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10177 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001198e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1198E 10320 bytes
SHA-256: 9bcce7993dfc2a29f71e611439fc2a8abb0f7fd7e81b231a16d1a51f432ba180