Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f9ae28be232a6a2…

MALICIOUS

PDF

69.0 KB Created: 2021-07-01 10:08:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 53fbc3a8cb37390e72e842b767cdacf7 SHA-1: fe61ca96759f0f5bc1760a890e253d6e36e97294 SHA-256: 1f9ae28be232a6a2f85422518afb311622d500fa1893014f431e0aaf085d8f60
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and disposable hosting domains. These links likely serve as a lure for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/i763s21nv9mcsc2f241u2i22ii/gidexarekepe.pdf In PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/089f6ddb7113f356ac3b97fa0ab8dfbd/98634627880.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1762468e9---netilewujedinesisu.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f7c41dee7---widaraxubewidogo.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0888add18---fejilanuwurosamam.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b1236d8181351847c801bde0053dfd7e/zedosigebiwolenikujo.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/45883523088.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5c55494fc---kasotuputazubipewuwisu.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/th8apsgn84gs8n6qd4m7n6l9g4/kavebu.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/giwaputojuxudo.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd9837ef3a---figere.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/xajuvan.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/78b0bea108dd60c11a66000cef532090/voruwiwikifozinewamobina.pdfIn PDF document text
    • https://subarini.ro/mm/file/66488141296.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ba9ffbd7f9c---1030785124.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/5286196946198e810e3faaeecea4ecb8/4783913672.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/b38a1b78d04998a3fe12d0edb4038033/1069483126.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/12789222016.pdfIn PDF document text
    • http://dzbnf.com/upload/file///26811458954.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/mqratfg6q8adobn3mk365s8up4/wusanifakibitusawuzitaxib.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609df7711a4fc---gofoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=find+two+irrational+numberPDF 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_off0000b018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB018 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c82f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC82F 10544 bytes
SHA-256: 295b29e725a4d672567222b4a7cad66c1343b8a7b83601cc6ab3919f2c5069d4
font_02_sfnt_off0000e027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE027 15076 bytes
SHA-256: 35b104bee1a6ce456a27de33d0a6b3bc505588c1d80272616eda829c086e26ed

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