Malicious PDF — malware analysis report

Static analysis result for SHA-256 d87360dcdf71af2d…

MALICIOUS

PDF

74.5 KB Created: 2021-06-20 23:12:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 4fa404da990baa36f03b0f7a68b53e64 SHA-1: c4c1dec263a55b792211512891687dac2adbac5e SHA-256: d87360dcdf71af2d519c8f762be8d46dc36bb24286d991e8cc0c7784a988a24d
176 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning model as malicious, with ClamAV detecting it as Pdf.Phishing.Trojan. The document contains numerous embedded URLs and a QR code lure, directing users to potentially compromised websites hosted on various domains, many of which appear to be WordPress installations. The presence of these links and the detection indicate an attempt to deliver a phishing or malware payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://crysiq.ru/uplcv?utm_term=qr+code+for+beyblade+burst+app PDF link annotation
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1938a02c3d---xabizemaxukabomeluzis.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/6bcd0kqfikssqkf4c4algvj401/51155433722.pdfIn PDF document text
    • http://charivne.info/images/file/bivekulekidoxuropaxi.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/j2lkeim02eth9fs94mdqfdejvj/32079211854.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/40978933561.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095e015a71d7---67791558184.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbf24df88b---68230077988.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/texupezilufikizede.pdfIn PDF document text
    • http://dentherapia.hu/files/file/rexelajopoxenivotetogo.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16078f5bba14a4---gudubozivurixino.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701eb303bbd---mataj.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a41e397cfdc---jowavefumekotasulal.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a98af8ccc88---narosovizabaliru.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093afde1ba41---gidobomubuxu.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aabf68c1e9f---nobukowebanuwenalidu.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/26313488d31c8513693bc10b2813a7f1/99851164760.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_off0000e617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE617 5452 bytes
SHA-256: 26bd311d33b59dd9f8bbba7f73f084c6a120e94fbd2cdea0f4c2b6f86ae05c73
font_01_sfnt_off0000f8b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B3 10816 bytes
SHA-256: a39478e5d0a6545079ae6efa0fe7af6c474f3f2738187ba58cde05952cc6c817