Malicious PDF — malware analysis report

Static analysis result for SHA-256 70de69ba987513d9…

MALICIOUS

PDF

129.2 KB Created: 2021-06-10 04:00:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 095b7a736b8c8376abc772dafeabc190 SHA-1: 6d5fc923f0bf7cac2b8423b23ad04fad760d82c8 SHA-256: 70de69ba987513d9eb161b1ee5d28489957d615abfcad84d9e9cb9cdc5084d2e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The presence of embedded JavaScript, though not fully analyzed here, likely facilitates the redirection to these malicious sites, potentially for further payload delivery or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://chcial.ru/uplcv?utm_term=delf+b2+exercices+comprehension+ecrite PDF link annotation
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/05kt3a5kb5415kkl9cb07m5ol4/zalabir.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/0edumo1aq6o9ejtap69o48oo32/85056462759.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/f936fac1a98d83a6824d221b453fd689/bedawovagowurojamevad.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/715b8f1cbf6ba0bf974952a43623021f/7968746227.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/vanoduduripuw.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/j4phsdold76cughpor9mrstqp3/mofotowodowaberoxekawev.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/4tdqtl1mgp45ceov1oiuhhdpm4/zevanufikidox.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/27nbltioja6tdcbucv4b0qjr0e/rakugopepetodixejotago.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/4fbd8030c82ed3ad04e2a8393a707a01/fupexewev.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/39604570630.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a08c035fc---54476610004.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/dalipuko.pdfIn PDF document text
    • http://sns.hu/_user/file/sazosafojamilob.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/e88889e2c51bff8e65a39e853f270f0e/dawarir.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097d95a8a54c---lonemujoda.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b8e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B8E6 5384 bytes
SHA-256: 7943bc66f3fbe7e512ccd2d1ce9ac611d1b0518e57889db1df8e7d536992cf39
font_01_sfnt_off0001cb1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CB1B 13548 bytes
SHA-256: 68eba20709af82094c5719ef18ff33b2fd15cd92312cc1500b9397b667462c8f